fix(TreeView): add outline transparent for visible focus indicators #2433
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This PR updates TreeView based on feedback received for WHCM (Windows High Contrast Mode), specifically around focus and hover styles.
https://github.com/github/primer/issues/815#issuecomment-1273922579
By default, it uses a transparent outline in forced-colors: 'active' mode which will be visible in WHCM. For focus, it uses the
SelectedItem
keyword using the same technique.Preview of changes: https://www.loom.com/share/3c518ae9c39f4ed7b015010dd03e37c2
Before
Hover
Focus
After
Hover
Focus