x11: Add missing geometry checks in moveResizeInternal()

Currently, there is an assumption in the moveResizeInternal() method
that if the buffer geometry changes, then the client geometry will also
change. However, as it turns out, it's not completely true. For example,
if the window is maximized while its geometry already matches the
maximize area, the buffer geometry won't change, but the client geometry
will change.

This change adds missing geometry checks. *geometryBeforeBlocking
corresponds to the old geometry. We can use it to decide if the geometry
has changed.