libweston-desktop/xdg-shell: Consolidate configure event sending

When switching a state twice in a row, we were overwriting the old value
without setting it back, sending a wrong state to the client.

Now we update our requested state, then check if we need to schedule a
configure event, if we have one scheduled already or even if we can
cancel it.

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Daniel Stone <daniels@collabora.com>
2 files changed