NB#186402 The application is getting minimized on clicking close button
NB#186402 The application is getting minimized on clicking close button

 * src/mcompositemanager.cpp (MCompositeManagerPrivate::buttonEvent):
   Send a WM_DELETE_WINDOW to the topmost window which can decide then
   what it wants when the close button is clicked rather than starting
   the close animation unconditionally.

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