Fix Position Line gradient appearing in all editors no matter which one is playing #7882
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Currently in master, if you zoom in on both the song editor and the piano roll, then play either of them, both playhead/position lines will have their gradient/tail appear, even though only one of them is playing.
This is because the position line only checks if either the song or a midi clip is playing, as it doesn't directly know which editor it belongs to.
I fixed this issue by adding the PlayMode for the position line as an argument in its constructor, which it can use to check whether it's corresponding editor is playing, and if so, show the gradient.