Match background of selected icon to translucency setting

Use case or problem

The sidebars are translucent but the selected icons background (File list on the left, outline on the right) are grey.

Proposed solution

Add translucency to icons and other selection bg colors too when transparency is turn on in Appearance. I think it’s a bit unreasonable I need to go so far to change the color.

Current workaround (optional)

Use Minimal Theme Style Settings > Interface colors > Active Background and change the color
Or disable translucency

Related feature requests (optional)

none

Changed title to say what’s being requested (was “Ugly Translucency”).