1 files changed, 5 insertions, 2 deletions
diff --git a/src/client/views/nodes/PDFBox.tsx b/src/client/views/nodes/PDFBox.tsx
index 9807cee7c..fa23dfbe8 100644
--- a/src/client/views/nodes/PDFBox.tsx
+++ b/src/client/views/nodes/PDFBox.tsx
@@ -10,7 +10,7 @@ import { TraceMobx } from '../../../fields/util';
 import { emptyFunction, returnOne, setupMoveUpEvents, Utils } from '../../../Utils';
 import { Docs } from '../../documents/Documents';
 import { KeyCodes } from '../../util/KeyCodes';
-import { undoBatch } from '../../util/UndoManager';
+import { undoBatch, UndoManager } from '../../util/UndoManager';
 import { ContextMenu } from '../ContextMenu';
 import { ContextMenuProps } from '../ContextMenuItem';
 import { ViewBoxAnnotatableComponent, ViewBoxAnnotatableProps } from "../DocComponent";
@@ -137,18 +137,21 @@ export class PDFBox extends ViewBoxAnnotatableComponent<ViewBoxAnnotatableProps
         return this.addDocument(doc, sidebarKey);
     }
     sidebarBtnDown = (e: React.PointerEvent, onButton: boolean) => { // onButton determines whether the width of the pdf box changes, or just the ratio of the sidebar to the pdf
+        const batch = UndoManager.StartBatch("sidebar");
         setupMoveUpEvents(this, e, (e, down, delta) => {
             const localDelta = this.props.ScreenToLocalTransform().scale(this.props.scaling?.() || 1).transformDirection(delta[0], delta[1]);
             const nativeWidth = NumCast(this.layoutDoc[this.fieldKey + "-nativeWidth"]);
+            const nativeHeight = NumCast(this.layoutDoc[this.fieldKey + "-nativeHeight"]);
             const curNativeWidth = NumCast(this.layoutDoc.nativeWidth, nativeWidth);
             const ratio = (curNativeWidth + (onButton ? 1 : -1) * localDelta[0] / (this.props.scaling?.() || 1)) / nativeWidth;
             if (ratio >= 1) {
                 this.layoutDoc.nativeWidth = nativeWidth * ratio;
+                this.layoutDoc.nativeHeight = nativeHeight * (1 + ratio);
                 onButton && (this.layoutDoc._width = this.layoutDoc[WidthSym]() + localDelta[0]);
                 this.layoutDoc._showSidebar = nativeWidth !== this.layoutDoc._nativeWidth;
             }
             return false;
-        }, emptyFunction, () => this.toggleSidebar());
+        }, () => batch.end(), () => this.toggleSidebar());
     }
     @observable _previewNativeWidth: Opt<number> = undefined;
     @observable _previewWidth: Opt<number> = undefined;