Bug 239429 - display URL in status bar while using bookmark & history sidebars. patch from Michael Schonfeld <dev@schonfeld.org>, r=me, a=beltzner.

browser/components/places/content/bookmarksPanel.xul

@@ -49,7 +49,8 @@
 <page id="bookmarksPanel"
       xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
       xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-      onload="init();">
+      onload="init();"
+      onunload="SidebarUtils.clearURLFromStausBar();">
 
   <script type="application/x-javascript" 
           src="chrome://browser/content/bookmarks/sidebarUtils.js"/>
@@ -72,7 +73,9 @@
         hidecolumnpicker="true"
         context="placesContext"
         onkeypress="if (event.keyCode == 13) this.controller.openSelectedNodeWithEvent(event);"
-        onclick="SidebarUtils.handleClick(this, event);">
+        onclick="SidebarUtils.handleClick(this, event);"
+        onmousemove="SidebarUtils.handleTreeMouseMove(event);"
+        onmouseout="SidebarUtils.clearURLFromStausBar();">
     <treecols>
       <treecol id="title" flex="1" primary="true" hideheader="true"/>
     </treecols>

browser/components/places/content/history-panel.xul

@@ -57,7 +57,8 @@
 
 <page id="history-panel" orient="vertical"
       xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-      onload="HistorySidebarInit();">
+      onload="HistorySidebarInit();"
+      onunload="SidebarUtils.clearURLFromStausBar();">
 
   <script type="application/x-javascript" 
           src="chrome://browser/content/bookmarks/sidebarUtils.js"/>
@@ -120,7 +121,9 @@
         context="placesContext"
         onkeypress="if (event.keyCode == 13) this.controller.openSelectedNodeWithEvent(event);"
         hidecolumnpicker="true"
-        onclick="SidebarUtils.handleClick(this, event, true);">
+        onclick="SidebarUtils.handleClick(this, event, true);"
+        onmousemove="SidebarUtils.handleTreeMouseMove(event);"
+        onmouseout="SidebarUtils.clearURLFromStausBar();">
     <treecols>
       <treecol id="title" flex="1" primary="true" hideheader="true"/>
     </treecols>

browser/components/places/content/sidebarUtils.js

@@ -69,5 +69,37 @@ var SidebarUtils = {
       tbo.view.selection.select(row.value);
       aTree.controller.openSelectedNodeWithEvent(aEvent);
     }
+  },
+  
+  /**
+   * The following function displays the URL of a node that is being
+   * hovered over.
+   */
+  handleTreeMouseMove: function SU_handleTreeMouseMove(aEvent) {
+    if (aEvent.target.localName != "treechildren")
+      return;
+
+    var tree = aEvent.target.parentNode;
+    var tbo = tree.treeBoxObject;
+    var row = { }, col = { }, obj = { };
+    tbo.getCellAt(aEvent.clientX, aEvent.clientY, row, col, obj);
+
+    // row.value is -1 when the mouse is hovering an empty area within the tree.
+    // To avoid showing a URL from a previously hovered node,
+    // for a currently hovered non-url node, we must clear the URL from the
+    // status bar in these cases.
+    if (row.value != -1) {
+      var cell = tree.view.nodeForTreeIndex(row.value);
+      if (PlacesUtils.nodeIsURI(cell))
+        window.top.XULBrowserWindow.setOverLink(cell.uri, null);
+      else
+        this.clearURLFromStausBar();
+    }
+    else
+      this.clearURLFromStausBar();
+  },
+
+  clearURLFromStausBar: function SU_clearURLFromStausBar() {
+    window.top.XULBrowserWindow.setOverLink("", null);  
   }
 };