"smart" apps from doing stupid things before they get MapNotify.
This avoids the recent Java+OracleInstaller strange problem too.
The patch may look huge, but it's only adding two KWin wrappers
for X(Un)GrabServer() and uncommenting the calls in Client::manage().
svn path=/trunk/kdebase/kwin/; revision=271152
Since Qt propagates mouse events up the widget hierarchy, it's better
to filter out Qt events rather than X events for the decoration.
svn path=/trunk/kdebase/kwin/; revision=252346
