D23098: [x11] Fix crash during tear down

[Vlad Zagorodniy]

zzag added inline comments.

INLINE COMMENTS

> zzag wrote in composite.cpp:1052
> > qobject_cast is slower in some cases
> 
> When?

Also `static` in a method or a function means taking a lock on a mutex... Performance impact won't be huge, but still...

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23098

To: zzag, #kwin
Cc: anthonyfieroni, kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart
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