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Vlad Zahorodnii authored
In case Xwayland does not use multiple buffers, the currently attached buffer is going to be destroyed if the frame window is resized. It may render the previous and the current window pixmap invalid and thus result in visual artifacts when an X11 client is being interactively resized. In order to avoid the visual artifacts, this change disables support for synchronized resizing for X11 clients if the version of Xwayland is less than the version in which Xwayland started using multiple buffers, i.e. 1.21. Differential Revision: https://phabricator.kde.org/D29250
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