[Bug 1940417]

[Simon-may]

(In reply to Jani Uusitalo from comment #26)
> I can't speak for Jeroen, but I played around with the upstream builds (both 92 and 91) and my faulty profile a bit and managed to isolate the trigger combination for this: `MOZ_ENABLE_WAYLAND=1` and setting `layout.css.devPixelsPerPx` to my preferred value of `1.2`; either resetting `layout.css.devPixelsPerPx` to its default (`-1.0`), or running Firefox without `MOZ_ENABLE_WAYLAND=1` will make the toolbar items work again. [Here's the graphics portion of my `about:support`](https://pastebin.mozilla.org/OdgM9Oox).
> 
> **So my steps to reproduce this are:**
> 1. start Firefox with `MOZ_ENABLE_WAYLAND=1`
> 2. set `layout.css.devPixelsPerPx` to `1.2`
> 3. click on the hamburger menu button
> 
> **What I expect to happen:**
> For the hamburger menu content to show.
> 
> **What happens instead:**
> The hamburger menu content flickers or doesn't show at all.

Just for reference/as a workaround: A value of `1.25` for
`layout.css.devPixelsPerPx` seems to work flawlessly for me (I was also
using `1.2` :-) ).

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

Title:
  On Wayland toolbar menus are sometimes invisible/flickering

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