Seems like the LN tail is also being processed here. Since we disabled tail conversion for Hold Off in #24552, we might as well do the same for Invert (and also extends the tail to the next note)

Seems like the LN tail is also being processed here. Since we disabled tail conversion for Hold Off in #24552, we might as well do the same for Invert (and also extends the tail to the next note)

If I understand correctly, the result would be the same as: Hold Off, then current version of Inverse.
Alternatively, or as an option, long notes could be converted into gaps of free space. So LN-rich maps will convert into more complex finger control maps, and full LN maps into simple maps without overlap. 
Although ln start to release of the previous note, release to ln start of the next one could feels weird since releases in original map may not be attached to any sound.

Or we can go with a middle ground: Keep existing LN unchanged, and turn regular notes to LN that extends until the next note. I don't think the community will accept an Invert mod that removes LN.

Good idea, It's implementation definitely should depend on what people think they want to use.
I might ask it here and there.
about options tho, my version is taking 'Invert' literally, so may be good to leave it as a checkbox

actually I don't get it. What goes after the end of original LN?

Or we can go with a middle ground: Keep existing LN unchanged, and turn regular notes to LN that extends until the next note.