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gs-feature-tile: Switch to WCAG contrast instead of Weber contrast

Philip Withnall requested to merge pwithnall/gnome-software:1440-wcag-contrast into main

The Weber contrast was routinely always returning -1.0 for dark foreground colours (i.e. black text), which meant it was not so useful for making decisions with.

Switching to the WCAG contrast ratio (as defined at https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html) seems to produce better results.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

Fixes: #1440 (closed)

Closes #1440 (closed)

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