D28674: Implement a updateXTime compatible with Xcb and XWayland

[Méven Car]

meven added inline comments.

INLINE COMMENTS

> x11client.cpp:2912
>          performMoveResize();
>          updateWindowPixmap();
>      } else // setReadyForPainting does as well, but there's a small chance for resize syncs after the resize ended

Is it necessary to call this here ?
Added in https://phabricator.kde.org/D26914
I have tried removing it and in X it seems unoticeable and in Wayland gets rid of the flickering and my XWayland window matches Xorg behavior.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D28674

To: meven, #kwin, davidedmundson, zzag
Cc: kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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