(In reply to Itiel from comment #2) > Bug 1570879 is the most likely regressor, but otoh in the "Good" state the entire title bar is always black, whereas in the bad state it's purple-ish. So I'm not sure if bug 1570879 made the bug apparent, or if it actually regressed it. It seemed that bug 1570879 made the bug apparent. Before the fix, high contrast mode did not work as expected when compositor window was used. With the following command, "2 caption buttons" problem seems to exist longer time. ./mach mozregression --good 2019-06-12 --pref gfx.webrender.force-disabled:true gfx.direct3d11.use-double-buffering:false intl.l10n.pseudo:bidi J saw Comment 1 problem only when pref "intl.l10n.pseudo:bidi" was added dynamically from about:config. It seems like a different problem.
Bug 1715990 Comment 3 Edit History
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(In reply to Itiel from comment #2) > Bug 1570879 is the most likely regressor, but otoh in the "Good" state the entire title bar is always black, whereas in the bad state it's purple-ish. So I'm not sure if bug 1570879 made the bug apparent, or if it actually regressed it. It seemed that bug 1570879 made the bug apparent. Before the fix, high contrast mode did not work as expected when compositor window was used. With the following command, "2 caption buttons" problem seems to exist longer time. ./mach mozregression --good 2019-06-12 --pref gfx.webrender.force-disabled:true gfx.direct3d11.use-double-buffering:false intl.l10n.pseudo:bidi