Ah, OK. We've been arguing with different assumptions.
Symptom: Firefox's menus don't work
Bug: XMir's focus behaviour differs from a spec-compliant X11 window manager.
One solution here, which is what I've been suggesting, is to implement
spec-compliant focus behaviour in XMir.
But you're correct that simply making the popups non-focusable Mir
surfaces will make XMir behave more like a spec-compliant X11 window
manager, should make it behave *enough* like a spec-compliant WM to
resolve the symptom and may well be simpler to implement. This could be
an expedient solution for the short term.
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Xmir -rootless: Firefox menus pop up then close right away
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