Fix mouse event handling in both glvideomixer and compositor to check if upstream handled navigation events themselves. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9139>
Fix mouse event handling in both glvideomixer and compositor to check if upstream handled navigation events themselves. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9139>