3 files changed, 11 insertions, 15 deletions
diff --git a/src/Utils.ts b/src/Utils.ts
index 852083834..502cf7db7 100644
--- a/src/Utils.ts
+++ b/src/Utils.ts
@@ -514,6 +514,10 @@ export function intersectRect(r1: { left: number; top: number; width: number; he
     return !(r2.left > r1.left + r1.width || r2.left + r2.width < r1.left || r2.top > r1.top + r1.height || r2.top + r2.height < r1.top);
 }
 
+export function stringHash(s?:string) {
+    return !s? undefined:  Math.abs(s.split('').reduce((a: any, b: any) => ((a) => a & a)((a << 5) - a + b.charCodeAt(0)),0));
+}
+
 export function percent2frac(percent: string) {
     return Number(percent.substr(0, percent.length - 1)) / 100;
 }
diff --git a/src/client/views/nodes/WebBox.tsx b/src/client/views/nodes/WebBox.tsx
index 5a07540da..2c5398e40 100644
--- a/src/client/views/nodes/WebBox.tsx
+++ b/src/client/views/nodes/WebBox.tsx
@@ -14,7 +14,7 @@ import { listSpec } from '../../../fields/Schema';
 import { Cast, NumCast, StrCast, WebCast } from '../../../fields/Types';
 import { ImageField, WebField } from '../../../fields/URLField';
 import { TraceMobx } from '../../../fields/util';
-import { addStyleSheet, addStyleSheetRule, clearStyleSheetRules, emptyFunction, getWordAtPoint, lightOrDark, returnFalse, returnOne, returnZero, setupMoveUpEvents, smoothScroll, Utils } from '../../../Utils';
+import { addStyleSheet, addStyleSheetRule, clearStyleSheetRules, emptyFunction, getWordAtPoint, lightOrDark, returnFalse, returnOne, returnZero, setupMoveUpEvents, smoothScroll, stringHash, Utils } from '../../../Utils';
 import { Docs, DocUtils } from '../../documents/Documents';
 import { DocumentManager } from '../../util/DocumentManager';
 import { ScriptingGlobals } from '../../util/ScriptingGlobals';
@@ -83,7 +83,7 @@ export class WebBox extends ViewBoxAnnotatableComponent<FieldViewProps>() implem
         return this.webField?.toString() || '';
     }
     @computed get _urlHash() {
-        return this._url ? WebBox.urlHash(this._url) + '' : '';
+        return ""+ (stringHash(this._url)??'');
     }
     @computed get scrollHeight() {
         return Math.max(NumCast(this.layoutDoc._height), this._scrollHeight);
@@ -624,15 +624,6 @@ export class WebBox extends ViewBoxAnnotatableComponent<FieldViewProps>() implem
         return false;
     };
 
-    static urlHash = (s: string) => {
-        const split = s.split('');
-        return Math.abs(
-            split.reduce((a: any, b: any) => {
-                a = (a << 5) - a + b.charCodeAt(0);
-                return a & a;
-            }, 0)
-        );
-    };
     @action
     submitURL = (preview?: boolean, dontUpdateIframe?: boolean) => {
         try {
@@ -1154,5 +1145,5 @@ export class WebBox extends ViewBoxAnnotatableComponent<FieldViewProps>() implem
     }
 }
 ScriptingGlobals.add(function urlHash(url: string) {
-    return url ? WebBox.urlHash(url) : 0;
+    return stringHash(url);
 });
diff --git a/src/client/views/nodes/trails/PresBox.tsx b/src/client/views/nodes/trails/PresBox.tsx
index 9e5ea9524..1b2c45e72 100644
--- a/src/client/views/nodes/trails/PresBox.tsx
+++ b/src/client/views/nodes/trails/PresBox.tsx
@@ -3,7 +3,7 @@ import { Tooltip } from '@mui/material';
 import { action, computed, IReactionDisposer, makeObservable, observable, ObservableSet, reaction, runInAction } from 'mobx';
 import { observer } from 'mobx-react';
 import * as React from 'react';
-import { Doc, DocListCast, FieldResult, NumListCast, Opt, StrListCast } from '../../../../fields/Doc';
+import { Doc, DocListCast, Field, FieldResult, NumListCast, Opt, StrListCast } from '../../../../fields/Doc';
 import { Animation, DocData } from '../../../../fields/DocSymbols';
 import { Copy, Id } from '../../../../fields/FieldSymbols';
 import { InkField } from '../../../../fields/InkField';
@@ -13,7 +13,7 @@ import { listSpec } from '../../../../fields/Schema';
 import { ComputedField, ScriptField } from '../../../../fields/ScriptField';
 import { BoolCast, Cast, DocCast, NumCast, StrCast } from '../../../../fields/Types';
 import { AudioField } from '../../../../fields/URLField';
-import { emptyFunction, emptyPath, lightOrDark, returnFalse, returnOne, setupMoveUpEvents, StopEvent } from '../../../../Utils';
+import { emptyFunction, emptyPath, lightOrDark, returnFalse, returnOne, setupMoveUpEvents, StopEvent, stringHash } from '../../../../Utils';
 import { DocServer } from '../../../DocServer';
 import { Docs } from '../../../documents/Documents';
 import { CollectionViewType, DocumentType } from '../../../documents/DocumentTypes';
@@ -440,7 +440,8 @@ export class PresBox extends ViewBoxBaseComponent<FieldViewProps>() {
             else {
                 const bestTargetData = bestTarget[DocData];
                 const current = bestTargetData[fkey];
-                bestTargetData[fkey + '_' + Date.now()] = current instanceof ObjectField ? current[Copy]() : current;
+                const hash = bestTargetData[fkey] ? stringHash(Field.toString(bestTargetData[fkey] as Field)) : undefined;
+                if (hash)  bestTargetData[fkey + '_' +hash] = current instanceof ObjectField ? current[Copy]() : current;
                 bestTargetData[fkey] = activeItem.config_data instanceof ObjectField ? activeItem.config_data[Copy]() : activeItem.config_data;
             }
             bestTarget[fkey + '_usePath'] = activeItem.config_usePath;