x11: explicitly query map status when waiting for map event

For some reason, mpv sometimes does not get a MapNotify event with
GtkSocket embedding. This happens maybe 1 out of 10 times. I'm not sure
how this can happen - it certainly shouldn't. Since I was not able to
find the cause, and causes an apparent "deadlock", here's a lazy hack to
fix the misbehavior.

1 files changed, 6 insertions, 0 deletions

diff --git a/video/out/x11_common.c b/video/out/x11_common.c
index af603b2ac8..f5a3f9e808 100644
--- a/video/out/x11_common.c
+++ b/video/out/x11_common.c
@@ -1356,6 +1356,12 @@ static void wait_until_mapped(struct vo *vo)
     if (!x11->pseudo_mapped)
         x11_send_ewmh_msg(x11, "_NET_REQUEST_FRAME_EXTENTS", (long[5]){0});
     while (!x11->pseudo_mapped && x11->window) {
+        XWindowAttributes att;
+        XGetWindowAttributes(x11->display, x11->window, &att);
+        if (att.map_state != IsUnmapped) {
+            x11->pseudo_mapped = true;
+            break;
+        }
         XEvent unused;
         XPeekEvent(x11->display, &unused);
         vo_x11_check_events(vo);