for a window (and tab view item). This implicit key view is created
when a window is made key and does not have an explicit key view loop,
which is detected by checking the initial first responder of the
window.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@35632 72102866-910b-0410-8b05-ffd578937521
