D28674: Implement a updateXTime compatible with Xcb and XWayland

[Vlad Zahorodnii]

zzag added inline comments.

INLINE COMMENTS

> meven wrote in x11client.cpp:2912
> 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.

Yes, because user can resize a window more than once during a vblank interval and it's not guaranteed that there won't be any pending sync requests before the next compositing cycle starts.

REPOSITORY
  R108 KWin

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

To: meven, #kwin, davidedmundson, zzag
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