* BUG: Window.Show() works again on hidden windows.

[GB.GTK3]
* BUG: Window.Show() works again on hidden windows.

[GB.QT4]
* BUG: Window.Show() works again on hidden windows.

[GB.QT5]
* BUG: Window.Show() works again on hidden windows.


git-svn-id: svn://localhost/gambas/trunk@8044 867c0c6c-44f3-4631-809d-bfa615b0a4ec