Removed the code to set a folder charset by charset menu, we only use charset menu for message override, bug 43101, r=mscott.

mailnews/base/resources/content/shareglue.js

@@ -36,9 +36,11 @@ function MessengerSetDefaultCharacterSet(aCharset)
 {
     dump(aCharset);dump("\n");
     messenger.SetDocumentCharset(aCharset);
-	var folderResource = GetSelectedFolderResource();
-	SetFolderCharset(folderResource, aCharset);
-	RefreshThreadTreeView();
+
+// folder charset to be set by folder property not by charset menu
+//	var folderResource = GetSelectedFolderResource();
+//	SetFolderCharset(folderResource, aCharset);
+//	RefreshThreadTreeView();
   // DO NOT try to reload the message here. we do this automatically now in
   //  messenger.SetDocumentCharset. You'll just break things and reak havoc
   // if you call MsgReload() here...