Revert "Decouple scrolling to selection from painting entirely"

This reverts commit 449df006162372ad77e6cea2cf048a9e3f1a8025.

Decouple scrolling to selection from painting entirely

Make dark mode color flip branchless

Inline LightColor logic

No extra wxColour conversion

Tighten code

Remove redundant code

Give canvas a context for deferred action

Revert "Avoid extra Refresh on macOS"

This reverts commit 500ceee82fe964c06580a3ed17961bfd6ee06b67.

Better experience on macOS