displaying a table containing the stage no longer crashes the page

HISTORY.md

@@ -11,9 +11,13 @@
     * changed zebra-coloring for yellow custom block prototypes (in the block editor) so the hat block changes the shade, not the prototype
     * improved layout and rendering of (+) buttons in custom block prototypes
 * **Notable Fixes:**
+    * displaying a table containing the stage no longer crashes the page
     * correct identities when combining the items of an empty list with + /  * / min / max
 
-### 2021-03-03
+### 2021-03-05
+* tables, objects: displaying a table containing the stage no longer crashes the page
+
+### 2021-03-04
 * gui: added trash button for undeleting sprites
 * gui: accept drops of sprites and sprite-icons in trash button
 * gui: animate undeleted sprites to glide back onstage

snap.html

@@ -10,12 +10,12 @@
         <script src="src/widgets.js?version=2021-01-05"></script>
         <script src="src/blocks.js?version=2021-02-27"></script>
         <script src="src/threads.js?version=2021-03-02"></script>
-        <script src="src/objects.js?version=2021-03-02"></script>
+        <script src="src/objects.js?version=2021-03-05"></script>
         <script src="src/gui.js?version=2021-03-04"></script>
         <script src="src/paint.js?version=2020-05-17"></script>
         <script src="src/lists.js?version=2021-02-20"></script>
         <script src="src/byob.js?version=2021-03-01"></script>
-        <script src="src/tables.js?version=2020-10-06"></script>
+        <script src="src/tables.js?version=2021-03-05"></script>
         <script src="src/sketch.js?version=2020-07-13"></script>
         <script src="src/video.js?version=2019-06-27"></script>
         <script src="src/maps.js?version=2020-03-25"></script>

src/objects.js

@@ -84,7 +84,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph,  BooleanSlotMorph,
 localize, TableMorph, TableFrameMorph, normalizeCanvas, VectorPaintEditorMorph,
 AlignmentMorph, Process, WorldMap, copyCanvas, useBlurredShadows*/
 
-modules.objects = '2021-March-02';
+modules.objects = '2021-March-05';
 
 var SpriteMorph;
 var StageMorph;
@@ -9080,18 +9080,19 @@ StageMorph.prototype.fullImage = Morph.prototype.fullImage;
 
 // StageMorph thumbnail
 
-StageMorph.prototype.thumbnail = function (extentPoint, recycleMe) {
+StageMorph.prototype.thumbnail = function (extentPoint, recycleMe, noWatchers) {
     // answer a new Canvas of extentPoint dimensions containing
     // my thumbnail representation keeping the originial aspect ratio
     // a "recycleMe canvas can be passed for re-use
-    return this.fancyThumbnail(extentPoint, null, false, recycleMe);
+    return this.fancyThumbnail(extentPoint, null, false, recycleMe, noWatchers);
 };
 
 StageMorph.prototype.fancyThumbnail = function (
     extentPoint,
     excludedSprite,
     nonRetina,
-    recycleMe
+    recycleMe,
+    noWatchers
 ) {
     var src = this.getImage(),
         scale = Math.min(
@@ -9130,7 +9131,7 @@ StageMorph.prototype.fancyThumbnail = function (
         ctx.restore();
     }
     this.children.forEach(morph => {
-        if (morph.isVisible && (morph !== excludedSprite)) {
+        if ((isSnapObject(morph) || !noWatchers) && morph.isVisible && (morph !== excludedSprite)) {
             fb = morph.fullBounds();
             fimg = morph.fullImage();
             if (fimg.width && fimg.height) {

src/tables.js

@@ -7,7 +7,7 @@
     written by Jens Mönig
     jens@moenig.org
 
-    Copyright (C) 2020 by Jens Mönig
+    Copyright (C) 2021 by Jens Mönig
 
     This file is part of Snap!.
 
@@ -70,7 +70,7 @@ SpriteMorph, Context, Costume, BlockEditorMorph, SymbolMorph, IDE_Morph, Sound,
 SyntaxElementMorph, MenuMorph, SpriteBubbleMorph, SpeechBubbleMorph, CellMorph,
 ListWatcherMorph, BoxMorph, Variable, isSnapObject, useBlurredShadows*/
 
-modules.tables = '2020-October-06';
+modules.tables = '2021-March-05';
 
 var Table;
 var TableCellMorph;
@@ -381,7 +381,7 @@ TableCellMorph.prototype.render = function (ctx) {
 TableCellMorph.prototype.dataRepresentation = function (dta) {
     if (dta instanceof Morph) {
         if (isSnapObject(dta)) {
-            return dta.thumbnail(new Point(40, 40));
+            return dta.thumbnail(new Point(40, 40), null, true); // no watchers
         } else {
             return dta.fullImage();
         }