-I just want to disable the annoying whtsapp headsup notification on lollipop. -I dont want to Completely stop the notification by unchecking the "show notification" option in the application manager.
A non root option is now available. The HeadsOff app can disable all Lollipop Heads-up notifications on your phone. It can also disable Heads-up notifications only for selected apps. If you purchase the Pro key you can restore the ticker text in the status-bar to see a little notification preview.