[Bug 1940417]

[Simon-may]

In fact, it seems really strange what values for
`layout.css.devPixelsPerPx` trigger this – `1.22` also seems to work
without issues, while other values (like `1.21`) don’t.

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https://bugs.launchpad.net/bugs/1940417

Title:
  On Wayland toolbar menus are sometimes invisible/flickering

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