Provide function to offset columned Fingerings

Introduces

• event-funcetion offsetFingering in ly/music-functions-init.ly
• snippet offsetting-columned-fingerings.ly in Documentation/snippets/new/
• regtest input/regression/fingering-offset-column.ly Extends Documentation/en/notation/editorial.itely Extends Documentation/en/changes.tely Includes running makelsr

added Patchnew label

Well, I'm thinking it over now: isn't ly:grob-translate-axis! supposed to preserve existing offsets? When the engraver sets Y-offset, we could let it do so only without a user override, with the C++ equivalent of ly:grob-property-data, or a ly:grob-chain-callback, something like that. I don't mean to diminish the work you've put in here, but that would have the advantage of letting tweaks just work out-of-the-box.

Iiuc, you suggest to change the C++-coding.
I'd be fine with it, alas my C++-knowledge is approx. zero, can't do it myself.
Do you volunteer? ;)

With no guarantees, I'll give that a try (after flushing the patches in my queue).

Ok, for now I created #6125 and will set this one to "needs work" for now.
Thanks.

reg test diff

regtest as expected.

added Patchreview label and removed Patchnew label

added Patchneeds_work label and removed Patchreview label

Any updates on this? Does this need more work or an entirely different design? In either case, should we keep it open or close it for the time being?

closed

removed Patchneeds_work label

mentioned in issue #6125