fixed #2446

HISTORY.md

@@ -4,10 +4,12 @@
 * **New Features:**
 * **Notable Changes:**
 * **Notable Fixes:**
+    * list watchers occasionally didn't show cells after reassigning a changed list to a variable
 * **Translation Updates:**
 
 ### 2019-07-01
 * new dev version
+* lists: fixed #2446
 
 ## v5
 ### 2019-06-27

snap.html

@@ -11,7 +11,7 @@
         <script type="text/javascript" src="src/objects.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-07-01"></script>
         <script type="text/javascript" src="src/paint.js?version=2019-06-27"></script>
-        <script type="text/javascript" src="src/lists.js?version=2019-06-27"></script>
+        <script type="text/javascript" src="src/lists.js?version=2019-07-01"></script>
         <script type="text/javascript" src="src/byob.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/tables.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/symbols.js?version=2019-06-27"></script>

src/lists.js

@@ -62,7 +62,7 @@ CellMorph, ArrowMorph, MenuMorph, snapEquals, Morph, isNil, localize, isString,
 MorphicPreferences, TableDialogMorph, SpriteBubbleMorph, SpeechBubbleMorph,
 TableFrameMorph, TableMorph, Variable, isSnapObject, Costume*/
 
-modules.lists = '2019-June-04';
+modules.lists = '2019-July-01';
 
 var List;
 var ListWatcherMorph;
@@ -605,7 +605,7 @@ ListWatcherMorph.prototype.init = function (list, parentCell) {
     this.list = list || new List();
     this.start = 1;
     this.range = 100;
-    this.lastUpdated = Date.now();
+    this.lastUpdated = 0;
     this.lastCell = null;
     this.parentCell = parentCell || null; // for circularity detection