[fixed] Wings3D 2.0 on OSX,quit by window close button,then crash.

[tkbd]

dgud, Thanks for reply!

I was also repeated the test and then many times.
It seems that likely it cause when cancel the RMB menu after and quit.
Therefore it hides in other procedures,then this issue was difficult to reproduce.
It has also occurred by exit from the menu bar.

I found a way which easy to reproduce this error on OSX.

1. Open RMB menu(for example on shape mode)
   
2. Move mouse cursor to out of menu.(Not execute any command)
   
3. Repeat 1-2 step. 10 or more times
   
4. quit Wings3D app from menu or window close button
   (but in some cases the issue may not occur :-( )
   
5. not save before quit dialog, click "NO"
   

Result:Apple's Error report window is appear.
In other OS,it wonder this problem occurs.

This occurred on Wings 2.0.1 too.
-----
tkbd