Better engraving and playback functionality for trills placed on chords

Your idea

MuseScore 4.1 brought significant features for customizing ornaments that mainly focus on chromatic alterations for ornaments. These, especially for trills, should also function for when the ornament is tied to a chord.

Problem to be solved

Currently, there is practically no plausible way to input a trill on top of a chord as shown below with the cue notes properly appearing and playback functioning properly.

The closest that MuseScore can currently get to achieving something similar to what is shown above without using any invisible workarounds is shown below. Even then, the playback will also not be correct.

The current implementation for customizing ornaments works great for single notes, but this functionality is simply not present for chords.

Prior art

No response

Additional context

The playback issues can be worked around by inputting invisible tremolos in another voice in the same measure. Even then, chord tremolos seem to not work properly when in the same voice, so each note has to be in a different voice.

Start by reproducing the chord-trill examples in the issue and reviewing the existing ornament customization behavior for single notes. Compare the current notation and playback with the desired cue-note presentation, including the invisible-tremolo workaround. Done means chord trills support the relevant customization, display cue notes plausibly, and play back correctly.