[Bug 1871644]

[B-emilio]

I fixed the wayland overdraw and the X11 artifacts, so I think this is
ready to go. I've tested this stack on KWin and GNOME, both X11 and
Wayland. Will test i3 and such asap.

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https://bugs.launchpad.net/bugs/1871644

Title:
  Top corners of Firefox windows have weird black protrusions from the
  rounded edges

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