fixing bug where icon "message" text would sometimes disappear

 * Occasionally text area occupied by icons with the "Message" attribute set
   would disappear. Reproduce by blurring the desktop and hovering the mouse on the icon.
 * Image buffer "backsafe" is used to save a copy of the icon box to restore after icon hovering,
   this copy was being made "before" rendering the text. Moved this operation right after that.