- Use .ab-icon:before, .ab-item:before, and #adminbarsearch:before to select all toolbar icons.
- Rewrite the selector for toolbar icon hover styles so they're not overridden by default colors.
- Add #adminbarsearch:before to color schemes, so its icon color is changed with the others.
- Remove duplicate color rule on #adminbarsearch:before.
See #25858.
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