Twenty Ten: Visited link colours override custom colours

[laurelfulford]

In Twenty Ten, the visited link styles (purple text) override the less-specific custom colours. This is especially problematic when the link is in a button with a dark background, since it's difficult to read.

[laurelfulford]

Twenty Ten - buttons; the first one uses the default colours, the rest use custom backgrounds and text colours.

[laurelfulford]

Twenty Ten - buttons; the first one uses the default colours, the rest use custom backgrounds and text colours - after fix.

[laurelfulford]

45434.patch​ adds a visited state to the custom colour selectors, so they override the theme's visited link styles.

[davidakennedy]

@laurelfulford This is good to go. Good catch, as I don't think this was done in laters default themes.

[Joen]

Patch looks good 👍 👍! Thank you for all your work.

[laurelfulford]

In 44188:

Twenty Ten: Custom colors should override :visited link styles on blocks.

Make sure the block editor custom colors in the theme also override the theme's :visited link styles. This prevents contrast issues, like in the button block -- when the background is dark, the purple :visited link can be difficult to read.

Fixes #45434.

[desrosj]

Reopening and marking fixed-5.0 so that this can be properly merged into trunk.

[desrosj]

In 44299:

Twenty Ten: Custom colors should override :visited link styles on blocks.

Make sure the block editor custom colors in the theme also override the theme's :visited link styles. This prevents contrast issues, like in the button block -- when the background is dark, the purple :visited link can be difficult to read.

Props laurelfulford.

Merges [44188] into trunk.

Fixes #45434.