[plasmashell] [Bug 479755] [Wayland] Invisible icons/texts in the logout screen if an icc color profile is used

[Zamundaaa]

https://bugs.kde.org/show_bug.cgi?id=479755

--- Comment #2 from Zamundaaa <xaver.hugl at gmail.com> ---
To be honest, looking at the code of the logout greeter, I don't know how it
chooses its colors - text and icons are always white for me, independently of
what the colorscheme says? This is the case for me on Plasma 5 at least, it
doesn't work at all for me on 6 so it's hard to test.

What I do know though is that it has 50% translucent text+icons on top of a 50%
translucent background window. The first 50% are always being blended in gamma
2.2 space, but the second one is gamma 2.2 without color management, and linear
with color management.
So if the background is black, the background window is black and the text is
100% white, the first blending step brings the text down to 50% brightness, and
the second
- without color management: to 25%
- with color management: to 11%
(assuming a perfectly black background). The difference in readability should
be obvious - though the state without color management is also not good by any
means.

So I think this has to be fixed here in the logout greeter - ideally by not
relying on opacity to signal focus in the first place. Perhaps it can be
aligned more to how focus is shown everywhere else?

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