touch drag and drop

[zou lan]

Hi all

I find a issue in touch drag and drop caused by function
data_device_end_drag_grab.

when data_device_end_drag_grab call weston_view_unmap
and weston_view_destroy,
if the view->surface is commited but not repaint, the callback in
view->surface's callbacklist will not sent done. The drag window on client
side will hang in waiting callback.

I use weston 1.8.0. Test case is the the Qt filedialog demo.  Is there any
method to reslove this issue? Thank you.

Best Regards
Nancy
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