Bug #324194 --> more UI changes for the new 3-pane look.

Change the sidebar header styling.

mail/base/content/messenger.xul

@@ -176,9 +176,9 @@
     <vbox id="folderPaneBox" minwidth="100" width="200" persist="collapsed width">
     
       <label id="folderColumnLabel" hidden="true" value="&folderColumn.label;"/>
-      <hbox id="folderPaneHeader" align="center">
+      <sidebarheader id="folderPaneHeader" align="center">
         <label id="folderpane-title" value="&folderPaneHeader.label;"/>
-      </hbox>
+      </sidebarheader>
       
       <tree id="folderTree" class="plain focusring" flex="1" seltype="single" selstyle="primary"
             context="folderPaneContext"

mail/themes/qute/mail/mailWindow1.css

@@ -51,7 +51,7 @@
 
 /* Don't use the listbox appearance as that gives us a blue-grey top border
    that collides with the primary toolbar border */
-#threadTree {
+#threadTree, #folderTree {
   -moz-appearance:  none;
   background-color: -moz-Field;
   color: -moz-FieldText;
@@ -872,9 +872,6 @@ treechildren::-moz-tree-cell-text(lc-black, selected, focus) {
 /* ..... folder pane adjustments ..... */
 
 #folderPaneHeader {
-  height: 29px;
-  border: none;
-  background-color: transparent;
 }
 
 #folderpane-title {
@@ -886,15 +883,13 @@ treechildren::-moz-tree-cell-text(lc-black, selected, focus) {
 /* ..... splitter adjustments ..... */
 
 #folderpane_splitter {
-  border: none;
-  background-color: transparent;
+  border-right: none;
 }
 
 #gray_vertical_splitter,
 #threadpane-splitter {
   border: none;
   min-height: 5px;
-  background-color: transparent;
 }
 
 /* ..... tree adjustments ..... */