1. undid the "simplification" of patch 1096066 which resulted in a crash

1. undid the "simplification" of patch 1096066 which resulted in a crash
   (see this patch discussion)
2. check that all views agree to close before starting to delete them
3. commented the code so that the next poor soul looking at it will know
   that deleting a view can delete the document which deletes -- surely
   wasn't obvious to me...

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32172 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775