With changes to the playhead to correctly draw when separated from the
vertical line (for time stretching) some parts are slightly misaligned.
This PR corrects the vertical alignment of the top of the triangular
part to the number box. It also corrects horizontal alignment of the
vertical line to be pixel-aligned based on the interior, not the shadow
exterior.
Pull Request: https://projects.blender.org/blender/blender/pulls/147825
0262b939a0