desktop-shell: set the current size in the first 'resizing' configure event

Weston has sent the first 'resizing' configure event with width=height=0.
But resizing to that size doesn't make sense.
Instead, we now send the current width and height of the surface at the beginning
of resizing.

Signed-off-by: Ryo Munakata <ryomnktml@gmail.com>
1 file changed