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colorsapplicator: Don't allow extended RGB from OKLabToLinearSRGB

Akseli Lahtinen requested to merge work/akselmo/dont-allow-extended-rgb into master

When reading the rgb values in OKLabToLinearSRGB, there is a chance, when colors are tinted, for QColor::fromRgbF to return Extended RGB colors, which can invert. Read more at https://doc.qt.io/qt-6/qcolor.html#the-extended-rgb-color-model

Instead, just make sure we always return regular RGB values.

BUG: 503394 FIXED-IN: 6.3

This fixes the color boxes looking super weird with tinted colors

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Edited by Akseli Lahtinen

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