cherry-pick candidate for a future 1.20.9 release

[Matthieu Herrb]

Hi,

I'd like to nominate 364d64981549544213e2bca8de6ff8a5b2b5a69e as a
commit to cherry-pick into a future release of the 1.20 branch.

Without this commit, SDL 1.2 games in full screen get FocusOut events
every couple of seconds, and this is causing in some of them
(burgerspace is an example that was used to show me the issue) it will
pause the game, rendering it un-playable.

|commit 364d64981549544213e2bca8de6ff8a5b2b5a69e
|Author: Samuel Thibault <samuel.thibault at ens-lyon.org>
|Date:   Tue Oct 30 18:43:51 2018 +0100
|
|    dix: do not send focus event when grab actually does not change

Thanks in advance.
-- 
Matthieu Herrb
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