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wayland: Fix glitchy steam during interactive resize

Vlad Zahorodnii requested to merge work/glitchy-steam into master

Xwayland windows have two geometry types that are used during rendering

  • wl_surface's geometry and x11 window's geometry. Unfortunately, it's not possible just ignore the x11 window geometry because the window may have a custom shape region. Pixels outside the shape region can have arbitrary values; it's not guaranteed that the area outside the shape region will be transparent.

In some cases, the x11 window geometry can be larger than the wl_surface rect. That breaks repaint logic as the SurfaceItemXwayland can draw outside the bounding rect.

Specifically, this issue can be seen while resizing Steam interactively. Another example is where a video game enters fullscreen mode. I occasionally see that Red Dead Redemption II window leaves a ghost after itself when it switches to fullscreen mode.

It's not a perfect solution, but on the other hand, it doesn't look like there's a better way to handle this due to the fact that there are two conflicting geometry sources.

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