window handle only if window specific code is not called.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@21921 72102866-910b-0410-8b05-ffd578937521
Implement code to handle windows messages on a per-window basis.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@21916 72102866-910b-0410-8b05-ffd578937521