feat: enforce minimum contrast ratio for reverse video cursor #6584
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This PR ensures the reverse video cursor meets a minimum contrast ratio, otherwise the default fg/bg is used instead.
The minimum contrast ratio of
2.5was chosen from the kitty implementation linked in #2861.The
SrgbaTuple::contrast_ratioimplementation also appeared to be incorrect since it was comparing lightness instead of luminance.This should resolve #2861.
Before
After