x11: use new option stuff to implement fullscreen

- remove VOCTRL_FULLSCREEN and VOCTRL_GET_FULLSCREEN
- have your own m_config_cache for the fullscreen option
  (vo->opts_cache cannot be used because you lose per-option change
  notifications, and it'd be a mess anyway)
- use VOCTRL_VO_OPTS_CHANGED to update it
  (it's used for convenience)
- when updating it, check for the fullscreen option
  (wasn't sure how to do it best; currently, it compares the raw
  option pointers, but this could be changed)
- do not send VO_EVENT_FULLSCREEN_STATE on FS change
- instead write the option on FS change
  (assign in opt. struct + m_config_cache_write_opt)

1 files changed, 5 insertions, 2 deletions

diff --git a/video/out/vo.c b/video/out/vo.c
index e28026cab5..0effc41285 100644
--- a/video/out/vo.c
+++ b/video/out/vo.c
@@ -228,9 +228,12 @@ static void update_opts(void *p)
     if (m_config_cache_update(vo->opts_cache)) {
         read_opts(vo);
 
-        // "Legacy" update of video position related options.
-        if (vo->driver->control)
+        if (vo->driver->control) {
+            vo->driver->control(vo, VOCTRL_VO_OPTS_CHANGED, NULL);
+            // "Legacy" update of video position related options.
+            // Unlike VOCTRL_VO_OPTS_CHANGED, often not propagated to backends.
             vo->driver->control(vo, VOCTRL_SET_PANSCAN, NULL);
+        }
     }
 
     if (vo->gl_opts_cache && m_config_cache_update(vo->gl_opts_cache)) {