Do not re-use deleted window ids: somehow this crashes TGClient::GetWindowById, looks like there are several windows with the same id in one hash slot (due to some reason, window was not correctly un-registered)  and one of them eventually is dead.
Do not re-use deleted window ids: somehow this crashes TGClient::GetWindowById, looks like
there are several windows with the same id in one hash slot (due to some reason, window was not correctly un-registered) 
and one of them eventually is dead.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@43735 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT