Make the vertical separator next to the "Home" button not show up when

there are no buttons there.  Bug 80494, patch by Fabian
<hidday@geocities.com>, r=hwaara, sr=ben

suite/browser/navigator.js

@@ -215,9 +215,30 @@ nsButtonPrefListener.prototype =
       button.setAttribute("hidden","false");
     else
       button.setAttribute("hidden", "true");
+
+    // If all the buttons before the separator are hidden, also hide the
+    // separator
+    if(allLeftButtonsAreHidden())
+      document.getElementById("home-bm-separator").setAttribute("hidden", "true");
+    else
+      document.getElementById("home-bm-separator").removeAttribute("hidden");
   }
 }
 
+// Function allLeftButtonsAreHidden
+// Returns true if all the buttons left of the separator in the personal
+// toolbar are hidden, false otherwise.
+// Used by nsButtonPrefListener to hide the separator if needed
+function allLeftButtonsAreHidden() {
+  var buttonNode = document.getElementById("PersonalToolbar").firstChild;
+  while(buttonNode.tagName != "toolbarseparator") {
+    if(!buttonNode.hasAttribute("hidden") || buttonNode.getAttribute("hidden") == "false")
+      return false;
+    buttonNode = buttonNode.nextSibling;
+  }
+  return true;
+}
+
 function Startup()
 {
   // init globals

suite/browser/navigator.xul

@@ -217,7 +217,7 @@ Contributor(s): ______________________________________. -->
               ondragexit="nsDragAndDrop.dragExit(event, homeButtonObserver);"
               oncommand="BrowserHome(); event.preventBubble();"/>
   
-      <toolbarseparator/>
+      <toolbarseparator id="home-bm-separator" persist="hidden"/>
  
       <!-- "Bookmarks" button on personal toolbar -->                           
       <menubutton class="button-toolbar bookmark-item" id="bookmarks-button"