Fixing Bug 470263 - Use of <tree> needs to be updated to keep current selection in view upon reflow. r=bienvenu, mnyromyr. sr=neil. Patch by Stephen Lau <steve@grommit.com>.

mail/base/content/messenger.xul

@@ -192,6 +192,7 @@
       <tree id="folderTree" class="plain focusring" flex="1"
             treelines="true"
             hidecolumnpicker="true" persist="mode" mode="all"
+            keepcurrentinview="true"
             context="folderPaneContext"
             disableKeyNavigation="true"
             ondraggesture="gFolderTreeView._onDragStart(event);"
@@ -234,6 +235,7 @@
                   _selectDelay="500"
                   class="plain focusring"
                   lastfoldersent="false"
+                  keepcurrentinview="true"
                   disableKeyNavigation="true"
                   context="mailContext"
                   onkeypress="ThreadPaneKeyPress(event);"

mailnews/base/resources/content/messenger.xul

@@ -152,6 +152,7 @@
       <vbox id="folderPaneBox" minwidth="100" width="200" persist="collapsed width">
         <tree id="folderTree"
               treelines="true"
+              keepcurrentinview="true"
               flex="1"
               context="folderPaneContext"
               class="window-focusborder"
@@ -175,6 +176,7 @@
           <hbox id="threadPaneBox">
             <tree id="threadTree"
                   treelines="true"
+                  keepcurrentinview="true"
                   flex="1"
                   minwidth="100"
                   width="100"