Fixed the menu selection that was letting garbage #566
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This issue was introduced by the fix for another menu issue that was crashing Wings3D when closing a window with the context menu active (commit: #be68730)
The fix redraw the entire menu unselected before it be displayed. It was also needed to find for the window of the submenu item because it's not stored in the object property of menudata.
It was reported in this post
NOTE: Fixed the menu selection that was letting garbage. Thanks to sciroccorics