Merge branch 'master' into data-visualization-view-naafi

1 files changed, 212 insertions, 189 deletions

diff --git a/src/client/views/collections/TreeView.tsx b/src/client/views/collections/TreeView.tsx
index aa1330762..75e76019e 100644
--- a/src/client/views/collections/TreeView.tsx
+++ b/src/client/views/collections/TreeView.tsx
@@ -1,27 +1,29 @@
 import { IconProp } from '@fortawesome/fontawesome-svg-core';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
-import { action, computed, IReactionDisposer, observable, ObservableMap, reaction } from 'mobx';
+import { action, computed, IReactionDisposer, observable, reaction } from 'mobx';
 import { observer } from 'mobx-react';
-import { DataSym, Doc, DocListCast, DocListCastOrNull, Field, HeightSym, Opt, StrListCast, WidthSym } from '../../../fields/Doc';
+import { DataSym, Doc, DocListCast, Field, HeightSym, Opt, StrListCast, WidthSym } from '../../../fields/Doc';
 import { Id } from '../../../fields/FieldSymbols';
 import { List } from '../../../fields/List';
 import { RichTextField } from '../../../fields/RichTextField';
 import { listSpec } from '../../../fields/Schema';
 import { ComputedField, ScriptField } from '../../../fields/ScriptField';
-import { BoolCast, Cast, NumCast, ScriptCast, StrCast } from '../../../fields/Types';
+import { BoolCast, Cast, DocCast, FieldValue, NumCast, ScriptCast, StrCast } from '../../../fields/Types';
 import { TraceMobx } from '../../../fields/util';
-import { emptyFunction, returnEmptyDoclist, returnEmptyFilter, returnEmptyString, returnFalse, returnOne, returnTrue, simulateMouseClick, Utils } from '../../../Utils';
+import { emptyFunction, returnEmptyDoclist, returnEmptyFilter, returnEmptyString, returnFalse, returnTrue, returnZero, simulateMouseClick, Utils } from '../../../Utils';
 import { Docs, DocUtils } from '../../documents/Documents';
 import { CollectionViewType, DocumentType } from '../../documents/DocumentTypes';
 import { DocumentManager } from '../../util/DocumentManager';
 import { DragManager, dropActionType } from '../../util/DragManager';
+import { LinkManager } from '../../util/LinkManager';
+import { ScriptingGlobals } from '../../util/ScriptingGlobals';
 import { SelectionManager } from '../../util/SelectionManager';
 import { SnappingManager } from '../../util/SnappingManager';
 import { Transform } from '../../util/Transform';
 import { undoBatch, UndoManager } from '../../util/UndoManager';
 import { EditableView } from '../EditableView';
 import { TREE_BULLET_WIDTH } from '../global/globalCssVariables.scss';
-import { DocumentView, DocumentViewInternal, DocumentViewProps, StyleProviderFunc } from '../nodes/DocumentView';
+import { DocumentView, DocumentViewInternal, DocumentViewProps, OpenWhere, StyleProviderFunc } from '../nodes/DocumentView';
 import { FieldViewProps } from '../nodes/FieldView';
 import { FormattedTextBox } from '../nodes/formattedText/FormattedTextBox';
 import { RichTextMenu } from '../nodes/formattedText/RichTextMenu';
@@ -31,7 +33,6 @@ import { CollectionTreeView, TreeViewType } from './CollectionTreeView';
 import { CollectionView } from './CollectionView';
 import './TreeView.scss';
 import React = require('react');
-import { ScriptingGlobals } from '../../util/ScriptingGlobals';
 
 export interface TreeViewProps {
     treeView: CollectionTreeView;
@@ -44,7 +45,7 @@ export interface TreeViewProps {
     containerCollection: Doc;
     renderDepth: number;
     dropAction: dropActionType;
-    addDocTab: (doc: Doc, where: string) => boolean;
+    addDocTab: (doc: Doc, where: OpenWhere) => boolean;
     panelWidth: () => number;
     panelHeight: () => number;
     addDocument: (doc: Doc | Doc[], relativeTo?: Doc, before?: boolean) => boolean;
@@ -55,7 +56,7 @@ export interface TreeViewProps {
     indentDocument?: (editTitle: boolean) => void;
     outdentDocument?: (editTitle: boolean) => void;
     ScreenToLocalTransform: () => Transform;
-    contextMenuItems: { script: ScriptField; filter: ScriptField; icon: string; label: string }[];
+    contextMenuItems?: { script: ScriptField; filter: ScriptField; icon: string; label: string }[];
     dontRegisterView?: boolean;
     styleProvider?: StyleProviderFunc | undefined;
     treeViewHideHeaderFields: () => boolean;
@@ -65,8 +66,8 @@ export interface TreeViewProps {
     skipFields?: string[];
     firstLevel: boolean;
     // TODO: [AL] add these
-    AddToMap?: (treeViewDoc: Doc, index: number[]) => Doc[];
-    RemFromMap?: (treeViewDoc: Doc, index: number[]) => Doc[];
+    AddToMap?: (treeViewDoc: Doc, index: number[]) => void;
+    RemFromMap?: (treeViewDoc: Doc, index: number[]) => void;
     hierarchyIndex?: number[];
 }
 
@@ -95,7 +96,7 @@ export class TreeView extends React.Component<TreeViewProps> {
     private _header: React.RefObject<HTMLDivElement> = React.createRef();
     private _tref = React.createRef<HTMLDivElement>();
     @observable _docRef: Opt<DocumentView>;
-    private _selDisposer: Opt<IReactionDisposer>;
+    private _disposers: { [name: string]: IReactionDisposer } = {};
     private _editTitleScript: (() => ScriptField) | undefined;
     private _openScript: (() => ScriptField) | undefined;
     private _treedropDisposer?: DragManager.DragDropDisposer;
@@ -168,37 +169,22 @@ export class TreeView extends React.Component<TreeViewProps> {
     @computed get selected() {
         return SelectionManager.IsSelected(this._docRef);
     }
-    //      SelectionManager.Views().lastElement()?.props.Document === this.props.document; }
-
-    @observable _presTimer!: NodeJS.Timeout;
-    @observable _presKeyEventsActive: boolean = false;
-
-    @observable _selectedArray: ObservableMap = new ObservableMap<Doc, any>();
-    // the selected item's index
-    @computed get itemIndex() {
-        return NumCast(this.doc._itemIndex);
-    }
-    // the item that's active
-    @computed get activeItem() {
-        return this.childDocs ? Cast(this.childDocs[NumCast(this.doc._itemIndex)], Doc, null) : undefined;
-    }
-    @computed get targetDoc() {
-        return Cast(this.activeItem?.presentationTargetDoc, Doc, null);
-    }
 
     childDocList(field: string) {
         const layout = Cast(Doc.LayoutField(this.doc), Doc, null);
-        return (
-            (this.props.dataDoc ? DocListCastOrNull(this.props.dataDoc[field]) : undefined) || // if there's a data doc for an expanded template, use it's data field
-            (layout ? DocListCastOrNull(layout[field]) : undefined) || // else if there's a layout doc, display it's fields
-            DocListCastOrNull(this.doc[field])
-        ); // otherwise use the document's data field
+        return DocListCast(this.props.dataDoc?.[field], DocListCast(layout?.[field], DocListCast(this.doc[field])));
     }
+    moving: boolean = false;
     @undoBatch move = (doc: Doc | Doc[], target: Doc | undefined, addDoc: (doc: Doc | Doc[]) => boolean) => {
         if (this.doc !== target && addDoc !== returnFalse) {
+            const canAdd1 = (this.props.parentTreeView as any).dropping || !(ComputedField.WithoutComputed(() => FieldValue(this.props.parentTreeView?.doc.data)) instanceof ComputedField);
+
             // bcz: this should all be running in a Temp undo batch instead of hackily testing for returnFalse
-            if (this.props.removeDoc?.(doc) === true) {
-                return addDoc(doc);
+            if (canAdd1 && this.props.removeDoc?.(doc) === true) {
+                this.props.parentTreeView instanceof TreeView && (this.props.parentTreeView.moving = true);
+                const res = addDoc(doc);
+                this.props.parentTreeView instanceof TreeView && (this.props.parentTreeView.moving = false);
+                return res;
             }
         }
         return false;
@@ -206,20 +192,21 @@ export class TreeView extends React.Component<TreeViewProps> {
     @undoBatch @action remove = (doc: Doc | Doc[], key: string) => {
         this.props.treeView.props.select(false);
         const ind = this.dataDoc[key].indexOf(doc);
+
         const res = (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && Doc.RemoveDocFromList(this.dataDoc, key, doc), true);
         res && ind > 0 && DocumentManager.Instance.getDocumentView(this.dataDoc[key][ind - 1], this.props.treeView.props.CollectionView)?.select(false);
         return res;
     };
 
     @action setEditTitle = (docView?: DocumentView) => {
-        this._selDisposer?.();
+        this._disposers.selection?.();
         if (!docView) {
             this._editTitle = false;
         } else if (docView.isSelected()) {
             const doc = docView.Document;
             SelectionManager.SelectSchemaViewDoc(doc);
             this._editTitle = true;
-            this._selDisposer = reaction(
+            this._disposers.selection = reaction(
                 () => SelectionManager.SelectedSchemaDoc(),
                 seldoc => seldoc !== doc && this.setEditTitle(undefined)
             );
@@ -236,7 +223,7 @@ export class TreeView extends React.Component<TreeViewProps> {
             const bestAlias =
                 docView.props.Document.author === Doc.CurrentUserEmail && !Doc.IsPrototype(docView.props.Document) ? docView.props.Document : DocListCast(this.props.document.aliases).find(doc => !doc.context && doc.author === Doc.CurrentUserEmail);
             const nextBestAlias = DocListCast(this.props.document.aliases).find(doc => doc.author === Doc.CurrentUserEmail);
-            this.props.addDocTab(bestAlias ?? nextBestAlias ?? Doc.MakeAlias(this.props.document), 'lightbox');
+            this.props.addDocTab(bestAlias ?? nextBestAlias ?? Doc.MakeAlias(this.props.document), OpenWhere.lightbox);
         }
     };
 
@@ -259,7 +246,8 @@ export class TreeView extends React.Component<TreeViewProps> {
     };
 
     componentWillUnmount() {
-        this._selDisposer?.();
+        this._renderTimer && clearTimeout(this._renderTimer);
+        Object.values(this._disposers).forEach(disposer => disposer?.());
         this._treeEle && this.props.unobserveHeight(this._treeEle);
         document.removeEventListener('pointermove', this.onDragMove, true);
         document.removeEventListener('pointermove', this.onDragUp, true);
@@ -268,6 +256,10 @@ export class TreeView extends React.Component<TreeViewProps> {
     }
 
     componentDidUpdate() {
+        this._disposers.opening = reaction(
+            () => this.treeViewOpen,
+            open => !open && (this._renderCount = 20)
+        );
         this.props.hierarchyIndex !== undefined && this.props.AddToMap?.(this.doc, this.props.hierarchyIndex);
     }
 
@@ -302,7 +294,7 @@ export class TreeView extends React.Component<TreeViewProps> {
         const pt = [e.clientX, e.clientY];
         const rect = this._header.current!.getBoundingClientRect();
         const before = pt[1] < rect.top + rect.height / 2;
-        const inside = pt[0] > Math.min(rect.left + 75, rect.left + rect.width * 0.75) || (!before && this.treeViewOpen && this.childDocList.length);
+        const inside = pt[0] > Math.min(rect.left + 75, rect.left + rect.width * 0.75) || (!before && this.treeViewOpen && this.childDocs?.length);
         this._header.current!.className = 'treeView-header';
         if (!this.props.treeView.outlineMode || DragManager.DocDragData?.treeViewDoc === this.props.treeView.rootDoc) {
             if (inside) this._header.current!.className += ' treeView-header-inside';
@@ -313,7 +305,7 @@ export class TreeView extends React.Component<TreeViewProps> {
     };
 
     public static makeTextBullet() {
-        const bullet = Docs.Create.TextDocument('-text-', {
+        const bullet = Docs.Create.TextDocument('', {
             layout: CollectionView.LayoutString('data'),
             title: '-title-',
             treeViewExpandedViewLock: true,
@@ -321,6 +313,7 @@ export class TreeView extends React.Component<TreeViewProps> {
             _viewType: CollectionViewType.Tree,
             hideLinkButton: true,
             _showSidebar: true,
+            _fitWidth: true,
             treeViewType: TreeViewType.outline,
             x: 0,
             y: 0,
@@ -333,7 +326,8 @@ export class TreeView extends React.Component<TreeViewProps> {
         });
         Doc.GetProto(bullet).title = ComputedField.MakeFunction('self.text?.Text');
         Doc.GetProto(bullet).data = new List<Doc>([]);
-        FormattedTextBox.SelectOnLoad = bullet[Id];
+        DocumentManager.Instance.AddViewRenderedCb(bullet, dv => dv.ComponentView?.setFocus?.());
+
         return bullet;
     }
 
@@ -361,30 +355,42 @@ export class TreeView extends React.Component<TreeViewProps> {
         if (!this._header.current) return;
         const rect = this._header.current.getBoundingClientRect();
         const before = pt[1] < rect.top + rect.height / 2;
-        const inside = this.props.treeView.fileSysMode && !this.doc.isFolder ? false : pt[0] > Math.min(rect.left + 75, rect.left + rect.width * 0.75) || (!before && this.treeViewOpen && this.childDocList.length);
+        const inside = this.props.treeView.fileSysMode && !this.doc.isFolder ? false : pt[0] > Math.min(rect.left + 75, rect.left + rect.width * 0.75) || (!before && this.treeViewOpen && this.childDocs?.length ? true : false);
         if (de.complete.linkDragData) {
             const sourceDoc = de.complete.linkDragData.linkSourceGetAnchor();
             const destDoc = this.doc;
-            DocUtils.MakeLink({ doc: sourceDoc }, { doc: destDoc }, 'tree link', '');
+            DocUtils.MakeLink(sourceDoc, destDoc, { linkRelationship: 'tree link' });
             e.stopPropagation();
         }
         const docDragData = de.complete.docDragData;
         if (docDragData && pt[0] < rect.left + rect.width) {
             if (docDragData.draggedDocuments[0] === this.doc) return true;
-            if (this.dropDocuments(docDragData.droppedDocuments, before, inside, docDragData.dropAction, docDragData.moveDocument, docDragData.treeViewDoc === this.props.treeView.props.Document)) {
+            if (this.dropDocuments(docDragData.droppedDocuments, before, inside, docDragData.dropAction, docDragData.removeDocument, docDragData.moveDocument, docDragData.treeViewDoc === this.props.treeView.props.Document)) {
                 e.stopPropagation();
             }
         }
     };
 
-    dropDocuments(droppedDocuments: Doc[], before: boolean, inside: number | boolean, dropAction: dropActionType, moveDocument: DragManager.MoveFunction | undefined, forceAdd: boolean) {
+    dropping: boolean = false;
+    dropDocuments(droppedDocuments: Doc[], before: boolean, inside: number | boolean, dropAction: dropActionType, removeDocument: DragManager.RemoveFunction | undefined, moveDocument: DragManager.MoveFunction | undefined, forceAdd: boolean) {
         const parentAddDoc = (doc: Doc | Doc[]) => this.props.addDocument(doc, undefined, before);
-        const canAdd = (!this.props.treeView.outlineMode && !StrCast((inside ? this.props.document : this.props.containerCollection)?.freezeChildren).includes('add')) || forceAdd;
-        const localAdd = (doc: Doc) => (Doc.AddDocToList(this.dataDoc, this.fieldKey, doc) && ((doc.context = this.doc.context) || true) ? true : false);
-        const addDoc = !inside ? parentAddDoc : (doc: Doc | Doc[]) => (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && localAdd(doc), true as boolean);
+        const localAdd = (doc: Doc | Doc[]) => {
+            const innerAdd = (doc: Doc) => {
+                const dataIsComputed = ComputedField.WithoutComputed(() => FieldValue(this.dataDoc[this.fieldKey])) instanceof ComputedField;
+                const added = (!dataIsComputed || (this.dropping && this.moving)) && Doc.AddDocToList(this.dataDoc, this.fieldKey, doc);
+                dataIsComputed && (doc.context = this.doc.context);
+                return added;
+            };
+            return (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && innerAdd(doc), true as boolean);
+        };
+        const addDoc = inside ? localAdd : parentAddDoc;
         const move = (!dropAction || dropAction === 'proto' || dropAction === 'move' || dropAction === 'same') && moveDocument;
+        const canAdd = (!this.props.treeView.outlineMode && !StrCast((inside ? this.props.document : this.props.containerCollection)?.freezeChildren).includes('add')) || forceAdd;
         if (canAdd) {
-            return UndoManager.RunInTempBatch(() => droppedDocuments.reduce((added, d) => (move ? move(d, undefined, addDoc) || (dropAction === 'proto' ? addDoc(d) : false) : addDoc(d)) || added, false));
+            this.props.parentTreeView instanceof TreeView && (this.props.parentTreeView.dropping = true);
+            const res = UndoManager.RunInTempBatch(() => droppedDocuments.reduce((added, d) => (move ? move(d, undefined, addDoc) || (dropAction === 'proto' ? addDoc(d) : false) : addDoc(d)) || added, false));
+            this.props.parentTreeView instanceof TreeView && (this.props.parentTreeView.dropping = false);
+            return res;
         }
         return false;
     }
@@ -398,32 +404,23 @@ export class TreeView extends React.Component<TreeViewProps> {
     };
     docTransform = () => this.refTransform(this._dref?.ContentRef?.current);
     getTransform = () => this.refTransform(this._tref.current);
-    docWidth = () => {
-        const layoutDoc = this.layoutDoc;
-        const aspect = Doc.NativeAspect(layoutDoc);
-        if (layoutDoc._fitWidth) return Math.min(this.props.panelWidth() - treeBulletWidth(), layoutDoc[WidthSym]());
-        if (aspect) return Math.min(layoutDoc[WidthSym](), Math.min(this.MAX_EMBED_HEIGHT * aspect, this.props.panelWidth() - treeBulletWidth()));
-        return Math.min((this.props.panelWidth() - treeBulletWidth()) / (this.props.treeView.props.NativeDimScaling?.() || 1), Doc.NativeWidth(layoutDoc) ? layoutDoc[WidthSym]() : this.layoutDoc[WidthSym]());
-    };
-    docHeight = () => {
-        const layoutDoc = this.layoutDoc;
-        return Math.max(
-            70,
-            Math.min(
-                this.MAX_EMBED_HEIGHT,
-                (() => {
-                    const aspect = Doc.NativeAspect(layoutDoc);
-                    if (aspect) return this.docWidth() / (aspect || 1);
-                    return layoutDoc._fitWidth
-                        ? !Doc.NativeHeight(this.doc)
-                            ? NumCast(this.props.containerCollection._height)
-                            : Math.min((this.docWidth() * NumCast(layoutDoc.scrollHeight, Doc.NativeHeight(layoutDoc))) / (Doc.NativeWidth(layoutDoc) || NumCast(this.props.containerCollection._height)))
-                        : layoutDoc[HeightSym]() || 50;
-                })()
-            )
+    embeddedPanelWidth = () => this.props.panelWidth() / (this.props.treeView.props.NativeDimScaling?.() || 1);
+    embeddedPanelHeight = () => {
+        const layoutDoc = (temp => temp && Doc.expandTemplateLayout(temp, this.props.document, ''))(this.props.treeView.props.childLayoutTemplate?.()) || this.layoutDoc;
+        return Math.min(
+            layoutDoc[HeightSym](),
+            this.MAX_EMBED_HEIGHT,
+            (() => {
+                const aspect = Doc.NativeAspect(layoutDoc);
+                if (aspect) return this.embeddedPanelWidth() / (aspect || 1);
+                return layoutDoc._fitWidth
+                    ? !Doc.NativeHeight(layoutDoc)
+                        ? NumCast(layoutDoc._height)
+                        : Math.min((this.embeddedPanelWidth() * NumCast(layoutDoc.scrollHeight, Doc.NativeHeight(layoutDoc))) / (Doc.NativeWidth(layoutDoc) || NumCast(this.props.containerCollection._height)))
+                    : (this.embeddedPanelWidth() * layoutDoc[HeightSym]()) / layoutDoc[WidthSym]();
+            })()
         );
     };
-
     @computed get expandedField() {
         const ids: { [key: string]: string } = {};
         const rows: JSX.Element[] = [];
@@ -435,14 +432,20 @@ export class TreeView extends React.Component<TreeViewProps> {
             const contents = doc[key];
             let contentElement: (JSX.Element | null)[] | JSX.Element = [];
 
+            let leftOffset = observable({ width: 0 });
+            const expandedWidth = () => this.props.panelWidth() - leftOffset.width;
             if (contents instanceof Doc || (Cast(contents, listSpec(Doc)) && Cast(contents, listSpec(Doc))!.length && Cast(contents, listSpec(Doc))![0] instanceof Doc)) {
                 const remDoc = (doc: Doc | Doc[]) => this.remove(doc, key);
-                const localAdd = (doc: Doc, addBefore?: Doc, before?: boolean) => {
-                    const added = Doc.AddDocToList(this.dataDoc, key, doc, addBefore, before, false, true);
-                    added && (doc.context = this.doc.context);
-                    return added;
+                const moveDoc = (doc: Doc | Doc[], target: Doc | undefined, addDoc: (doc: Doc | Doc[]) => boolean) => this.move(doc, target, addDoc);
+                const addDoc = (doc: Doc | Doc[], addBefore?: Doc, before?: boolean) => {
+                    const innerAdd = (doc: Doc) => {
+                        const dataIsComputed = ComputedField.WithoutComputed(() => FieldValue(this.dataDoc[key])) instanceof ComputedField;
+                        const added = (!dataIsComputed || (this.dropping && this.moving)) && Doc.AddDocToList(this.dataDoc, key, doc, addBefore, before, false, true);
+                        dataIsComputed && (doc.context = this.doc.context);
+                        return added;
+                    };
+                    return (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && innerAdd(doc), true as boolean);
                 };
-                const addDoc = (doc: Doc | Doc[], addBefore?: Doc, before?: boolean) => (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && localAdd(doc, addBefore, before), true);
                 contentElement = TreeView.GetChildElements(
                     contents instanceof Doc ? [contents] : DocListCast(contents),
                     this.props.treeView,
@@ -453,13 +456,13 @@ export class TreeView extends React.Component<TreeViewProps> {
                     this.props.prevSibling,
                     addDoc,
                     remDoc,
-                    this.move,
+                    moveDoc,
                     this.props.dropAction,
                     this.props.addDocTab,
                     this.titleStyleProvider,
                     this.props.ScreenToLocalTransform,
                     this.props.isContentActive,
-                    this.props.panelWidth,
+                    expandedWidth,
                     this.props.renderDepth,
                     this.props.treeViewHideHeaderFields,
                     [...this.props.renderedIds, doc[Id]],
@@ -490,15 +493,21 @@ export class TreeView extends React.Component<TreeViewProps> {
                 );
             }
             rows.push(
-                <div style={{ display: 'flex' }} key={key}>
-                    <span style={{ fontWeight: 'bold' }}>{key + ':'}</span>
-                    &nbsp;
+                <div style={{ display: 'flex', overflow: 'auto' }} key={key}>
+                    <span
+                        ref={action((r: any) => {
+                            if (r) leftOffset.width = r.getBoundingClientRect().width;
+                        })}
+                        style={{ fontWeight: 'bold' }}>
+                        {key + ':'}
+                        &nbsp;
+                    </span>
                     {contentElement}
                 </div>
             );
         }
         rows.push(
-            <div style={{ display: 'flex' }} key={'newKeyValue'}>
+            <div style={{ display: 'flex', overflow: 'auto' }} key={'newKeyValue'}>
                 <EditableView
                     key="editableView"
                     contents={'+key:value'}
@@ -512,32 +521,12 @@ export class TreeView extends React.Component<TreeViewProps> {
         return rows;
     }
 
-    rtfWidth = () => {
-        const layout = (temp => temp && Doc.expandTemplateLayout(temp, this.props.document, ''))(this.props.treeView.props.childLayoutTemplate?.()) || this.layoutDoc;
-        return Math.min(layout[WidthSym](), this.props.panelWidth() - treeBulletWidth()) / (this.props.treeView.props.NativeDimScaling?.() || 1);
-    };
-    rtfHeight = () => {
-        const layout = (temp => temp && Doc.expandTemplateLayout(temp, this.props.document, ''))(this.props.treeView.props.childLayoutTemplate?.()) || this.layoutDoc;
-        return this.rtfWidth() <= layout[WidthSym]() ? Math.min(layout[HeightSym](), this.MAX_EMBED_HEIGHT) : this.MAX_EMBED_HEIGHT;
-    };
-    rtfOutlineHeight = () => Math.max(this.layoutDoc?.[HeightSym](), treeBulletWidth());
-    expandPanelHeight = () => {
-        if (this.layoutDoc._fitWidth) return this.docHeight();
-        const aspect = this.layoutDoc[WidthSym]() / this.layoutDoc[HeightSym]();
-        const docAspect = this.docWidth() / this.docHeight();
-        return docAspect < aspect ? this.docWidth() / aspect : this.docHeight();
-    };
-    expandPanelWidth = () => {
-        if (this.layoutDoc._fitWidth) return this.docWidth();
-        const aspect = this.layoutDoc[WidthSym]() / this.layoutDoc[HeightSym]();
-        const docAspect = this.docWidth() / this.docHeight();
-        return docAspect > aspect ? this.docHeight() * aspect : this.docWidth();
-    };
-
+    _renderTimer: any;
+    @observable _renderCount = 1;
     @computed get renderContent() {
         TraceMobx();
         const expandKey = this.treeViewExpandedView;
-        const sortings = this.props.styleProvider?.(this.doc, this.props.treeView.props, StyleProp.TreeViewSortings) as { [key: string]: { color: string; label: string } };
+        const sortings = (this.props.styleProvider?.(this.doc, this.props.treeView.props, StyleProp.TreeViewSortings) as { [key: string]: { color: string; label: string } }) ?? {};
         if (['links', 'annotations', 'aliases', this.fieldKey].includes(expandKey)) {
             const sorting = StrCast(this.doc.treeViewSortCriterion, TreeSort.None);
             const sortKeys = Object.keys(sortings);
@@ -547,6 +536,7 @@ export class TreeView extends React.Component<TreeViewProps> {
             );
             const key = (expandKey === 'annotations' ? `${this.fieldKey}-` : '') + expandKey;
             const remDoc = (doc: Doc | Doc[]) => this.remove(doc, key);
+            const moveDoc = (doc: Doc | Doc[], target: Doc | undefined, addDoc: (doc: Doc | Doc[]) => boolean) => this.move(doc, target, addDoc);
             const localAdd = (doc: Doc, addBefore?: Doc, before?: boolean) => {
                 // if there's a sort ordering specified that can be modified on drop (eg, zorder can be modified, alphabetical can't),
                 // then the modification would be done here
@@ -557,14 +547,24 @@ export class TreeView extends React.Component<TreeViewProps> {
                     docs.push(doc);
                     docs.sort((a, b) => (NumCast(a.zIndex) > NumCast(b.zIndex) ? 1 : -1)).forEach((d, i) => (d.zIndex = i));
                 }
-                const added = Doc.AddDocToList(this.dataDoc, key, doc, addBefore, before, false, true);
-                added && (doc.context = this.doc.context);
+                const dataIsComputed = ComputedField.WithoutComputed(() => FieldValue(this.dataDoc[key])) instanceof ComputedField;
+                const added = (!dataIsComputed || (this.dropping && this.moving)) && Doc.AddDocToList(this.dataDoc, key, doc, addBefore, before, false, true);
+                !dataIsComputed && added && (doc.context = this.doc.context);
+
                 return added;
             };
             const addDoc = (doc: Doc | Doc[], addBefore?: Doc, before?: boolean) => (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && localAdd(doc, addBefore, before), true);
             const docs = expandKey === 'aliases' ? this.childAliases : expandKey === 'links' ? this.childLinks : expandKey === 'annotations' ? this.childAnnos : this.childDocs;
             let downX = 0,
                 downY = 0;
+            if (docs?.length && this._renderCount < docs?.length) {
+                this._renderTimer && clearTimeout(this._renderTimer);
+                this._renderTimer = setTimeout(
+                    action(() => {
+                        this._renderCount = Math.min(docs!.length, this._renderCount + 20);
+                    })
+                );
+            }
             return (
                 <>
                     {!docs?.length || this.props.AddToMap /* hack to identify pres box trees */ ? null : (
@@ -573,9 +573,10 @@ export class TreeView extends React.Component<TreeViewProps> {
                         </div>
                     )}
                     <ul
+                        style={{ cursor: 'inherit' }}
                         key={expandKey + 'more'}
                         title="click to change sort order"
-                        className={this.doc.treeViewHideTitle ? 'no-indent' : ''}
+                        className={''} //this.doc.treeViewHideTitle ? 'no-indent' : ''}
                         onPointerDown={e => {
                             downX = e.clientX;
                             downY = e.clientY;
@@ -599,7 +600,7 @@ export class TreeView extends React.Component<TreeViewProps> {
                                   this.props.prevSibling,
                                   addDoc,
                                   remDoc,
-                                  this.move,
+                                  moveDoc,
                                   StrCast(this.doc.childDropAction, this.props.dropAction) as dropActionType,
                                   this.props.addDocTab,
                                   this.titleStyleProvider,
@@ -621,15 +622,16 @@ export class TreeView extends React.Component<TreeViewProps> {
                                   // TODO: [AL] add these
                                   this.props.AddToMap,
                                   this.props.RemFromMap,
-                                  this.props.hierarchyIndex
+                                  this.props.hierarchyIndex,
+                                  this._renderCount
                               )}
                     </ul>
                 </>
             );
         } else if (this.treeViewExpandedView === 'fields') {
             return (
-                <ul key={this.doc[Id] + this.doc.title}>
-                    <div style={{ display: 'inline-block' }}>{this.expandedField}</div>
+                <ul key={this.doc[Id] + this.doc.title} style={{ cursor: 'inherit' }}>
+                    <div>{this.expandedField}</div>
                 </ul>
             );
         }
@@ -673,7 +675,7 @@ export class TreeView extends React.Component<TreeViewProps> {
         return (
             <div
                 className={`bullet${this.props.treeView.outlineMode ? '-outline' : ''}`}
-                key={'bullet'}
+                key="bullet"
                 title={this.childDocs?.length ? `click to see ${this.childDocs?.length} items` : 'view fields'}
                 onClick={this.bulletClick}
                 style={
@@ -692,7 +694,7 @@ export class TreeView extends React.Component<TreeViewProps> {
                         <FontAwesomeIcon size="sm" icon={[this.childDocs?.length && !this.treeViewOpen ? 'fas' : 'far', 'circle']} />
                     )
                 ) : (
-                    <div className="treeView-bulletIcons">
+                    <div className="treeView-bulletIcons" style={{ color: Doc.IsSystem(DocCast(this.doc.proto)) ? 'red' : undefined }}>
                         <div className={`treeView-${this.onCheckedClick ? 'checkIcon' : 'expandIcon'}`}>
                             <FontAwesomeIcon size="sm" icon={checked === 'check' ? 'check' : checked === 'x' ? 'times' : checked === 'unchecked' ? 'square' : !this.treeViewOpen ? 'caret-right' : 'caret-down'} />
                         </div>
@@ -705,7 +707,7 @@ export class TreeView extends React.Component<TreeViewProps> {
 
     @computed get validExpandViewTypes() {
         const annos = () => (DocListCast(this.doc[this.fieldKey + '-annotations']).length && !this.props.treeView.dashboardMode ? 'annotations' : '');
-        const links = () => (DocListCast(this.doc.links).length && !this.props.treeView.dashboardMode ? 'links' : '');
+        const links = () => (LinkManager.Links(this.doc).length && !this.props.treeView.dashboardMode ? 'links' : '');
         const data = () => (this.childDocs || this.props.treeView.dashboardMode ? this.fieldKey : '');
         const aliases = () => (this.props.treeView.dashboardMode ? '' : 'aliases');
         const fields = () => (Doc.noviceMode ? '' : 'fields');
@@ -721,6 +723,7 @@ export class TreeView extends React.Component<TreeViewProps> {
         this.treeViewOpen = true;
     };
 
+    @observable headerEleWidth = 0;
     @computed get headerElements() {
         return this.props.treeViewHideHeaderFields() || this.doc.treeViewHideHeaderFields ? null : (
             <>
@@ -736,7 +739,7 @@ export class TreeView extends React.Component<TreeViewProps> {
                         }}
                     />
                 )}
-                {this.doc.treeViewExpandedViewLock || Doc.IsSystem(this.doc) ? null : (
+                {Doc.noviceMode ? null : this.doc.treeViewExpandedViewLock || Doc.IsSystem(this.doc) ? null : (
                     <span className="collectionTreeView-keyHeader" title="type of expanded data" key={this.treeViewExpandedView} onPointerDown={this.expandNextviewType}>
                         {this.treeViewExpandedView}
                     </span>
@@ -754,10 +757,10 @@ export class TreeView extends React.Component<TreeViewProps> {
         const makeFolder = { script: ScriptField.MakeFunction(`scriptContext.makeFolder()`, { scriptContext: 'any' })!, icon: 'folder-plus', label: 'New Folder' };
         const deleteItem = { script: ScriptField.MakeFunction(`scriptContext.deleteItem()`, { scriptContext: 'any' })!, icon: 'folder-plus', label: 'Delete' };
         const folderOp = this.childDocs?.length ? [makeFolder] : [];
-        const openAlias = { script: ScriptField.MakeFunction(`openOnRight(getAlias(self))`)!, icon: 'copy', label: 'Open Alias' };
+        const openAlias = { script: ScriptField.MakeFunction(`openDoc(getAlias(self), ${OpenWhere.addRight})`)!, icon: 'copy', label: 'Open Alias' };
         const focusDoc = { script: ScriptField.MakeFunction(`DocFocusOrOpen(self)`)!, icon: 'eye', label: 'Focus or Open' };
         return [
-            ...this.props.contextMenuItems.filter(mi => (!mi.filter ? true : mi.filter.script.run({ doc: this.doc })?.result)),
+            ...(this.props.contextMenuItems ?? []).filter(mi => (!mi.filter ? true : mi.filter.script.run({ doc: this.doc })?.result)),
             ...(this.doc.isFolder
                 ? folderOp
                 : Doc.IsSystem(this.doc)
@@ -782,7 +785,7 @@ export class TreeView extends React.Component<TreeViewProps> {
 
     onChildDoubleClick = () => ScriptCast(this.props.treeView.Document.treeViewChildDoubleClick, !this.props.treeView.outlineMode ? this._openScript?.() : null);
 
-    refocus = () => this.props.treeView.props.focus(this.props.treeView.props.Document);
+    refocus = () => this.props.treeView.props.focus(this.props.treeView.props.Document, {});
     ignoreEvent = (e: any) => {
         if (this.props.isContentActive(true)) {
             e.stopPropagation();
@@ -792,29 +795,39 @@ export class TreeView extends React.Component<TreeViewProps> {
     titleStyleProvider = (doc: Doc | undefined, props: Opt<DocumentViewProps>, property: string): any => {
         if (!doc || doc !== this.doc) return this.props?.treeView?.props.styleProvider?.(doc, props, property); // properties are inherited from the CollectionTreeView, not the hierarchical parent in the treeView
 
+        const treeView = this.props.treeView;
+        // prettier-ignore
         switch (property.split(':')[0]) {
-            case StyleProp.Opacity:
-                return this.props.treeView.outlineMode ? undefined : 1;
-            case StyleProp.BackgroundColor:
-                return this.selected ? '#7089bb' : StrCast(doc._backgroundColor, StrCast(doc.backgroundColor));
+            case StyleProp.Opacity:         return this.props.treeView.outlineMode ? undefined : 1;
+            case StyleProp.BackgroundColor: return this.selected ? '#7089bb' : StrCast(doc._backgroundColor, StrCast(doc.backgroundColor));
+            case StyleProp.Highlighting:    if (this.props.treeView.outlineMode) return undefined;
+            case StyleProp.Hidden:          return false;
+            case StyleProp.BoxShadow:       return undefined;
             case StyleProp.DocContents:
-                return this.props.treeView.outlineMode ? null : (
+                const highlightIndex = this.props.treeView.outlineMode ? Doc.DocBrushStatus.unbrushed : Doc.isBrushedHighlightedDegree(doc);
+                const highlightColor = ['transparent', 'rgb(68, 118, 247)', 'rgb(68, 118, 247)', 'orange', 'lightBlue'][highlightIndex];
+                return treeView.outlineMode ? null : (
                     <div
                         className="treeView-label"
                         style={{
                             // just render a title for a tree view label (identified by treeViewDoc being set in 'props')
                             maxWidth: props?.PanelWidth() || undefined,
                             background: props?.styleProvider?.(doc, props, StyleProp.BackgroundColor),
+                            outline: `solid ${highlightColor} ${highlightIndex}px`,
+                            paddingLeft: NumCast(treeView.rootDoc.childXPadding, NumCast(treeView.props.childXPadding, Doc.IsComicStyle(doc)?20:0)),
+                            paddingRight: NumCast(treeView.rootDoc.childXPadding, NumCast(treeView.props.childXPadding, Doc.IsComicStyle(doc)?20:0)),
+                            paddingTop: treeView.props.childYPadding,
+                            paddingBottom: treeView.props.childYPadding,
                         }}>
                         {StrCast(doc?.title)}
                     </div>
                 );
-            default:
-                return this.props?.treeView?.props.styleProvider?.(doc, props, property);
         }
+        return treeView.props.styleProvider?.(doc, props, property);
     };
     embeddedStyleProvider = (doc: Doc | undefined, props: Opt<DocumentViewProps>, property: string): any => {
         if (property.startsWith(StyleProp.Decorations)) return null;
+        if (property.startsWith(StyleProp.Hidden)) return false;
         return this.props?.treeView?.props.styleProvider?.(doc, props, property); // properties are inherited from the CollectionTreeView, not the hierarchical parent in the treeView
     };
     onKeyDown = (e: React.KeyboardEvent, fieldProps: FieldViewProps) => {
@@ -841,7 +854,7 @@ export class TreeView extends React.Component<TreeViewProps> {
         }
         return false;
     };
-    titleWidth = () => Math.max(20, Math.min(this.props.treeView.truncateTitleWidth(), this.props.panelWidth() - 2 * treeBulletWidth()));
+    titleWidth = () => Math.max(20, Math.min(this.props.treeView.truncateTitleWidth(), this.props.panelWidth())) / (this.props.treeView.props.NativeDimScaling?.() || 1) - this.headerEleWidth - treeBulletWidth();
 
     return18 = () => 18;
     /**
@@ -885,11 +898,14 @@ export class TreeView extends React.Component<TreeViewProps> {
                     }
                 })}
                 Document={this.doc}
+                fitWidth={returnTrue}
                 DataDoc={undefined}
                 scriptContext={this}
                 hideDecorationTitle={this.props.treeView.outlineMode}
                 hideResizeHandles={this.props.treeView.outlineMode}
                 styleProvider={this.titleStyleProvider}
+                enableDragWhenActive={true}
+                onClickScriptDisable="never" // tree docViews have a script to show fields, etc.
                 docViewPath={returnEmptyDoclist}
                 treeViewDoc={this.props.treeView.props.Document}
                 addDocument={undefined}
@@ -903,7 +919,7 @@ export class TreeView extends React.Component<TreeViewProps> {
                 removeDocument={this.props.removeDoc}
                 ScreenToLocalTransform={this.getTransform}
                 NativeHeight={this.return18}
-                NativeWidth={this.titleWidth}
+                NativeWidth={returnZero}
                 PanelWidth={this.titleWidth}
                 PanelHeight={this.return18}
                 contextMenuItems={this.contextMenuItems}
@@ -916,10 +932,12 @@ export class TreeView extends React.Component<TreeViewProps> {
                 disableDocBrushing={this.props.treeView.props.disableDocBrushing}
                 hideLinkButton={BoolCast(this.props.treeView.props.Document.childHideLinkButton)}
                 dontRegisterView={BoolCast(this.props.treeView.props.Document.childDontRegisterViews, this.props.dontRegisterView)}
+                xPadding={NumCast(this.props.treeView.props.Document.childXPadding, this.props.treeView.props.childXPadding)}
+                yPadding={NumCast(this.props.treeView.props.Document.childYPadding, this.props.treeView.props.childYPadding)}
                 docFilters={returnEmptyFilter}
                 docRangeFilters={returnEmptyFilter}
                 searchFilterDocs={returnEmptyDoclist}
-                ContainingCollectionView={undefined}
+                ContainingCollectionView={this.props.treeView.props.CollectionView}
                 ContainingCollectionDoc={this.props.treeView.props.Document}
             />
         );
@@ -939,7 +957,7 @@ export class TreeView extends React.Component<TreeViewProps> {
                     }}>
                     {view}
                 </div>
-                <div className="treeView-rightButtons">
+                <div className="treeView-rightButtons" ref={action((r: any) => r && (this.headerEleWidth = r.getBoundingClientRect().width))}>
                     {buttons} {/* hide and lock buttons */}
                     {this.headerElements}
                 </div>
@@ -953,7 +971,6 @@ export class TreeView extends React.Component<TreeViewProps> {
                 <div
                     className={`treeView-header` + (editing ? '-editing' : '')}
                     key="titleheader"
-                    style={{ width: StrCast(this.doc.treeViewHeaderWidth, 'max-content') }}
                     ref={this._header}
                     onClick={this.ignoreEvent}
                     onPointerDown={this.ignoreEvent}
@@ -966,59 +983,63 @@ export class TreeView extends React.Component<TreeViewProps> {
         );
     };
 
+    fitWidthFilter = (doc: Doc) => (doc.type === DocumentType.IMG ? false : undefined);
     renderEmbeddedDocument = (asText: boolean, isActive: () => boolean | undefined) => {
-        const isExpandable = this.doc._treeViewGrowsHorizontally;
-        const panelWidth = asText || isExpandable ? this.rtfWidth : this.expandPanelWidth;
-        const panelHeight = asText ? this.rtfOutlineHeight : isExpandable ? this.rtfHeight : this.expandPanelHeight;
         return (
-            <DocumentView
-                key={this.doc[Id]}
-                ref={action((r: DocumentView | null) => (this._dref = r))}
-                Document={this.doc}
-                DataDoc={undefined}
-                PanelWidth={panelWidth}
-                PanelHeight={panelHeight}
-                NativeWidth={!asText && (this.layoutDoc.type === DocumentType.RTF || this.layoutDoc.type === DocumentType.SLIDER) ? this.rtfWidth : undefined}
-                NativeHeight={!asText && (this.layoutDoc.type === DocumentType.RTF || this.layoutDoc.type === DocumentType.SLIDER) ? this.rtfHeight : undefined}
-                LayoutTemplateString={asText ? FormattedTextBox.LayoutString('text') : undefined}
-                LayoutTemplate={this.props.treeView.props.childLayoutTemplate}
-                isContentActive={isActive}
-                isDocumentActive={isActive}
-                styleProvider={asText ? this.titleStyleProvider : this.embeddedStyleProvider}
-                hideTitle={asText}
-                fitContentsToBox={returnTrue}
-                hideDecorationTitle={this.props.treeView.outlineMode}
-                hideResizeHandles={this.props.treeView.outlineMode}
-                onClick={this.onChildClick}
-                focus={this.refocus}
-                onKey={this.onKeyDown}
-                hideLinkButton={BoolCast(this.props.treeView.props.Document.childHideLinkButton)}
-                dontRegisterView={BoolCast(this.props.treeView.props.Document.childDontRegisterViews, this.props.dontRegisterView)}
-                ScreenToLocalTransform={this.docTransform}
-                renderDepth={this.props.renderDepth + 1}
-                treeViewDoc={this.props.treeView?.props.Document}
-                rootSelected={returnTrue}
-                docViewPath={this.props.treeView.props.docViewPath}
-                docFilters={returnEmptyFilter}
-                docRangeFilters={returnEmptyFilter}
-                searchFilterDocs={returnEmptyDoclist}
-                ContainingCollectionDoc={this.props.containerCollection}
-                ContainingCollectionView={undefined}
-                addDocument={this.props.addDocument}
-                moveDocument={this.move}
-                removeDocument={this.props.removeDoc}
-                whenChildContentsActiveChanged={this.props.whenChildContentsActiveChanged}
-                addDocTab={this.props.addDocTab}
-                pinToPres={this.props.treeView.props.pinToPres}
-                disableDocBrushing={this.props.treeView.props.disableDocBrushing}
-                bringToFront={returnFalse}
-            />
+            <div style={{ height: this.embeddedPanelHeight(), width: this.embeddedPanelWidth() }}>
+                <DocumentView
+                    key={this.doc[Id]}
+                    ref={action((r: DocumentView | null) => (this._dref = r))}
+                    Document={this.doc}
+                    DataDoc={undefined}
+                    fitWidth={this.fitWidthFilter}
+                    PanelWidth={this.embeddedPanelWidth}
+                    PanelHeight={this.embeddedPanelHeight}
+                    LayoutTemplateString={asText ? FormattedTextBox.LayoutString('text') : undefined}
+                    LayoutTemplate={this.props.treeView.props.childLayoutTemplate}
+                    isContentActive={isActive}
+                    isDocumentActive={isActive}
+                    styleProvider={asText ? this.titleStyleProvider : this.embeddedStyleProvider}
+                    hideTitle={asText}
+                    //fitContentsToBox={returnTrue}
+                    hideDecorationTitle={this.props.treeView.outlineMode}
+                    hideResizeHandles={this.props.treeView.outlineMode}
+                    onClick={this.onChildClick}
+                    focus={this.refocus}
+                    onKey={this.onKeyDown}
+                    hideLinkButton={BoolCast(this.props.treeView.props.Document.childHideLinkButton)}
+                    dontRegisterView={BoolCast(this.props.treeView.props.Document.childDontRegisterViews, this.props.dontRegisterView)}
+                    ScreenToLocalTransform={this.docTransform}
+                    renderDepth={this.props.renderDepth + 1}
+                    treeViewDoc={this.props.treeView?.props.Document}
+                    rootSelected={returnTrue}
+                    docViewPath={this.props.treeView.props.docViewPath}
+                    docFilters={returnEmptyFilter}
+                    docRangeFilters={returnEmptyFilter}
+                    searchFilterDocs={returnEmptyDoclist}
+                    ContainingCollectionDoc={this.props.containerCollection}
+                    ContainingCollectionView={undefined}
+                    addDocument={this.props.addDocument}
+                    moveDocument={this.move}
+                    removeDocument={this.props.removeDoc}
+                    whenChildContentsActiveChanged={this.props.whenChildContentsActiveChanged}
+                    xPadding={NumCast(this.props.treeView.props.Document.childXPadding, this.props.treeView.props.childXPadding)}
+                    yPadding={NumCast(this.props.treeView.props.Document.childYPadding, this.props.treeView.props.childYPadding)}
+                    addDocTab={this.props.addDocTab}
+                    pinToPres={this.props.treeView.props.pinToPres}
+                    disableDocBrushing={this.props.treeView.props.disableDocBrushing}
+                    bringToFront={returnFalse}
+                    scriptContext={this}
+                />
+            </div>
         );
     };
 
     // renders the text version of a document as the header.  This is used in the file system mode and in other vanilla tree views.
     @computed get renderTitleAsHeader() {
-        return (
+        return this.props.treeView.Document.treeViewHideUnrendered && this.doc.unrendered && !this.doc.treeViewFieldKey ? (
+            <div></div>
+        ) : (
             <>
                 {this.renderBullet}
                 {this.renderTitle}
@@ -1038,7 +1059,7 @@ export class TreeView extends React.Component<TreeViewProps> {
 
     @computed get renderBorder() {
         const sorting = StrCast(this.doc.treeViewSortCriterion, TreeSort.None);
-        const sortings = this.props.styleProvider?.(this.doc, this.props.treeView.props, StyleProp.TreeViewSortings) as { [key: string]: { color: string; label: string } };
+        const sortings = (this.props.styleProvider?.(this.doc, this.props.treeView.props, StyleProp.TreeViewSortings) ?? {}) as { [key: string]: { color: string; label: string } };
         return (
             <div className={`treeView-border${this.props.treeView.outlineMode ? TreeViewType.outline : ''}`} style={{ borderColor: sortings[sorting]?.color }}>
                 {!this.treeViewOpen ? null : this.renderContent}
@@ -1050,15 +1071,15 @@ export class TreeView extends React.Component<TreeViewProps> {
         const pt = [de.clientX, de.clientY];
         const rect = this._header.current!.getBoundingClientRect();
         const before = pt[1] < rect.top + rect.height / 2;
-        const inside = this.props.treeView.fileSysMode && !this.doc.isFolder ? false : pt[0] > Math.min(rect.left + 75, rect.left + rect.width * 0.75) || (!before && this.treeViewOpen && this.childDocList.length);
+        const inside = this.props.treeView.fileSysMode && !this.doc.isFolder ? false : pt[0] > Math.min(rect.left + 75, rect.left + rect.width * 0.75) || (!before && this.treeViewOpen && this.childDocs?.length ? true : false);
 
-        const docs = this.props.treeView.onTreeDrop(de, (docs: Doc[]) => this.dropDocuments(docs, before, inside, 'copy', undefined, false));
+        const docs = this.props.treeView.onTreeDrop(de, (docs: Doc[]) => this.dropDocuments(docs, before, inside, 'copy', undefined, undefined, false));
     };
 
     render() {
         TraceMobx();
         const hideTitle = this.doc.treeViewHideHeader || (this.doc.treeViewHideHeaderIfTemplate && this.props.treeView.props.childLayoutTemplate?.()) || this.props.treeView.outlineMode;
-        return this.props.renderedIds.indexOf(this.doc[Id]) !== -1 ? (
+        return this.props.renderedIds?.indexOf(this.doc[Id]) !== -1 ? (
             '<' + this.doc.title + '>' // just print the title of documents we've previously rendered in this hierarchical path to avoid cycles
         ) : (
             <div
@@ -1118,7 +1139,7 @@ export class TreeView extends React.Component<TreeViewProps> {
         remove: undefined | ((doc: Doc | Doc[]) => boolean),
         move: DragManager.MoveFunction,
         dropAction: dropActionType,
-        addDocTab: (doc: Doc, where: string) => boolean,
+        addDocTab: (doc: Doc, where: OpenWhere) => boolean,
         styleProvider: undefined | StyleProviderFunc,
         screenToLocalXf: () => Transform,
         isContentActive: (outsideReaction?: boolean) => boolean,
@@ -1136,9 +1157,10 @@ export class TreeView extends React.Component<TreeViewProps> {
         unobserveHeight: (ref: any) => void,
         contextMenuItems: { script: ScriptField; filter: ScriptField; label: string; icon: string }[],
         // TODO: [AL] add these
-        AddToMap?: (treeViewDoc: Doc, index: number[]) => Doc[],
-        RemFromMap?: (treeViewDoc: Doc, index: number[]) => Doc[],
-        hierarchyIndex?: number[]
+        AddToMap?: (treeViewDoc: Doc, index: number[]) => void,
+        RemFromMap?: (treeViewDoc: Doc, index: number[]) => void,
+        hierarchyIndex?: number[],
+        renderCount?: number
     ) {
         const viewSpecScript = Cast(containerCollection.viewSpecScript, ScriptField);
         if (viewSpecScript) {
@@ -1146,11 +1168,12 @@ export class TreeView extends React.Component<TreeViewProps> {
         }
 
         const docs = TreeView.sortDocs(childDocs, StrCast(containerCollection.treeViewSortCriterion, TreeSort.None));
-        const rowWidth = () => panelWidth() - treeBulletWidth();
+        const rowWidth = () => panelWidth() - treeBulletWidth() * (treeView.props.NativeDimScaling?.() || 1);
         const treeViewRefs = new Map<Doc, TreeView | undefined>();
         return docs
             .filter(child => child instanceof Doc)
             .map((child, i) => {
+                if (renderCount && i > renderCount) return null;
                 const pair = Doc.GetLayoutDataDocPair(containerCollection, dataDoc, child);
                 if (!pair.layout || pair.data instanceof Promise) {
                     return null;