Update QNSView geometry on window resize.

Update QNSView geometry on window resize.

Ideally this should not be required since NSWindow
should resize the content view automatically. However,
in the case of modal QDialogs this does not happen.

Add call to updateGeometry in windowDidResize as a
workaround, and remove code which called QNSView::setFrameSize
with the current size.

This will cause duplicate handleGeometryChange calls
in the non-qdialog case, add a test to see if the geometry
really has changed to prevent that.

Change-Id: I29bea23b2ab72f923aeadf8db8cb9131ae177a28
Reviewed-by: Liang Qi <liang.qi@digia.com>