Problem: keyframe dots can be somewhat hard to see, especially behind the current frame marker line.
- Change the default theme to draw the keyframe dots larger. The current theme draws at 6px, for modern displays this should probably be increased to 7-9px. It's probably better to defer a concrete choice for this until T68982: Graph Editor: UI Scale effect on Curves drawing is done.
- Draw keyframe dots of selected keyframes on top of current frame line. Keep drawing unselected keyframe dots behind the line.