This is a work in progress script of mine, that will do this for track in pattern. It will soon be added to the full tool so that you can get the extra ranges covered like track in song.
note: It also re-orders the notes by pitch aswell as the left-aligning that you are after, so may not be 100% what you want.
edit: now in full tool in first post:
https://forum.renoise.com/t/new-tool-2-8-3-1-reorder-notes-by-pitch/39315
HTH