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Focus color of buttons should be more saturated/darker (Issue #2134) #2187
Issue #2134 reports an issue with hovering or tabbing focus onto a button lightens the button rather than darkens it, making it more apt to appear disabled.
This PR corrects this behavior by changing the derived color on hover and focused to -30% rather than +30%.
One potential remaining issue is the action that occurs when the button is focused upon tabbing; there is an animated effect that dims the button. While it is now darker than previous, it still becomes somewhat washed out and not as vivid as a mouse hover.