Bug 247116: fix infinite resize loop that causes the UI to jitter when the bookmarks toolbar is empty, patch by Dave Townsend <mossop.bugzilla@blueprintit.co.uk>, r=me

browser/components/bookmarks/content/bookmarksMenu.js

@@ -974,6 +974,7 @@ var BookmarksToolbar =
 
   resizeFunc: function(event) 
   { 
+    BookmarksToolbarRDFObserver._overflowTimerInEffect = false;
     if (event && event.type == 'focus') 
       window.removeEventListener('focus', BookmarksToolbar.resizeFunc, false); // hack for bug 266737
     var buttons = document.getElementById("bookmarks-ptf");
@@ -988,6 +989,11 @@ var BookmarksToolbar =
       return;
     }
 
+    if (buttons.childNodes.length == 0) {
+      chevron.collapsed = true;
+      return;
+    }
+
     var chevronWidth = 0;
     chevron.collapsed = false;
     chevronWidth = chevron.boxObject.width;
@@ -1015,7 +1021,6 @@ var BookmarksToolbar =
       }
       usedWidth += button.boxObject.width;
     }
-    BookmarksToolbarRDFObserver._overflowTimerInEffect = false;
   },
 
   // Fill in tooltips for personal toolbar