Timeline marker names are now correctly clipped instead of messily
overlapping each other and being unreadable. This change affects all
the animation editors (graph editor, NLA, action editor etc.) as well
as the VSE.
This also makes a change to when text is elevated. In the previous
behavior, a marker's text would be elevated if it was selected or if
the current frame was <= 4 frames away from the marker. This seems
like a completely arbitrary thing (probably added in to alleviate text
overlapping for markers that the user would be interested in). This
patch changes the behavior such that the marker's text will be elevated
if it is either selected or it is the last marker encountered relative
to the current frame.
abc46d5aeb