This module provides helper functions to be used in manageHook. Here's how you might use this:

 import XMonad.Hooks.ManageHelpers
 main =
     xmonad defaultConfig{
         ...
         manageHook = composeOne [
             isKDETrayWindow -?> doIgnore,
             transience,
             isFullscreen -?> doFullFloat,
             resource =? "stalonetray" -?> doIgnore
         ],
         ...
     }