[Bug 1871644]

[Robert Mader]

This just became even more prominent in 95 with colorways. We need a way
to support this with alpha visuals as XShape is neither available on
Wayland nor on X11 with HW Webrender - i.e. it's only available in
legacy fallback paths. As the default theme supports this (even though
with a grey corner), I suppose this is not really a graphics but rather
a theme issue.

Emilio, do you happen to know how the default theme gets its corners and
what would need to be done to make it work for other themes as well?

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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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