Fix for 47303. r=mscott

mailnews/base/resources/content/threadPane.js

@@ -21,19 +21,24 @@
 function ThreadPaneOnClick(event)
 {
     if (event.target.localName != "treecell" &&
-        event.target.localName != "treeitem")
+        event.target.localName != "treeitem" &&
+        event.target.localName != "image")
         return;
     
-    var targetclass = event.target.getAttribute('class');
+    if (event.target.localName == "image")
+      var targetclass = event.target.parentNode.getAttribute('class');
+    else 
+      var targetclass = event.target.getAttribute('class');
+
     dump('targetclass = ' + targetclass + '\n');
 
 	if(targetclass.indexOf('unreadcol') != -1)
 	{
-		ToggleMessageRead(event.target.parentNode.parentNode);
+		ToggleMessageRead(event.target.parentNode.parentNode.parentNode);
 	}
 	if(targetclass.indexOf('flagcol') != -1)
 	{
-		ToggleMessageFlagged(event.target.parentNode.parentNode);
+		ToggleMessageFlagged(event.target.parentNode.parentNode.parentNode);
 	}
     else if (targetclass == 'tree-cell-twisty') {
         // The twisty is nested three below the treeitem:

mailnews/base/resources/content/threadPane.xul

@@ -60,12 +60,14 @@ Rights Reserved.
                   MessageType="rdf:http://home.netscape.com/NC-rdf#MessageType"/>
             	<treecell class="treecell-text" value="rdf:http://home.netscape.com/NC-rdf#Sender" id ="SenderColumnTemplate"/>
 				<treecell class="treecell-image unreadcol" 
+                  allowevents="true"
                   value="rdf:http://home.netscape.com/NC-rdf#IsUnread"/>
 				<treecell class="treecell-text" value="rdf:http://home.netscape.com/NC-rdf#Date"/>
 				<treecell class="tree-cell-image prioritycol" 
   		            Priority="rdf:http://home.netscape.com/NC-rdf#Priority"
                   value="rdf:http://home.netscape.com/NC-rdf#PriorityString"/>
 				<treecell class="flagcol treecell-image" 
+                  allowevents="true"
                   value="rdf:http://home.netscape.com/NC-rdf#Flagged" />
 				<treecell class="treecell-text" value="rdf:http://home.netscape.com/NC-rdf#StatusString"/>
 				<treecell class="treecell-align-right" value="rdf:http://home.netscape.com/NC-rdf#Size"/>

xpfe/global/resources/content/treeBindings.xml

@@ -85,7 +85,11 @@
     </content>
   </binding>
 
-  <binding id="treecell-image" extends="xul:image"/>
+  <binding id="treecell-image">
+    <content autostretch="never">
+      <xul:image class="tree-cell-image" inherits="src"/>
+    </content>
+  </binding>
  
   <binding id="treecell-header">
     <content autostretch="never">