Feature Request: Mark Tonic Note in Piano Roll

It would help composers to be able to center the more prominent horizontal grid lines in the piano roll around the tonic note of the scale they're using. It would be a very helpful visual cue. Below is a mockup of the feature requested, where the prominent lines are beneath the F key, and the key marked across the piano roll is F Lydian.


Start by locating the piano-roll rendering and scale or key-selection entry points in the LMMS source; the issue does not name specific files or tests. Compare the existing grid with the supplied F Lydian mockup, and consider the feature complete when prominent horizontal lines are centered on the selected tonic across the piano roll.

Written by the indexing model from the issue text.