Submit batch buffers from flush callback chain

There are a few cases where the server will flush client output buffers
but our block handler only catches the most common (before going into select).
If the server flushes client buffers before we submit our batch buffer,
the client may receive a damage event for rendering that hasn't happened yet.

Instead, we can hook into the flush callback chain, which the server will
invoke just before flushing output.  This lets us submit batch buffers
before sending out events, preserving ordering.

Fixes 28438: [bisected] incorrect character in gnome-terminal under compiz
https://bugs.freedesktop.org/show_bug.cgi?id=28438

Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
Signed-off-by: Owain G. Ainsworth <oga@openbsd.org>
(Cherry picked from commit 69d65f9184006eac790efcff78a0e425160e95aa)

0 files changed, 0 insertions, 0 deletions