Engraving chords with the same note twice, but different accidentals

Hi all,

> Speaking as a keyboard player (and lilypond novice) I would recommend 
> re-spelling the a flat as a g sharp! Sometimes, theory has to take a backseat 
> to readability.

If theoretical correctness (or, say, accuracy to a previous source) isn't a 
requirement, then I agree with Charlie: this is a moment in which, as a 
keyboard player, I'd much rather see two different notes [by pitch name].

Otherwise, I'd say the split-stem convention is [perhaps counterintuitively?!] 
more readable for me. If you want to do this in Lilypond, I'm pretty sure Harm 
has solved this particular issue (see e.g., 


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