Fix earlier/later missing changeset update

[pickfire]

Fix #1059

cc @CptPotato

[archseer]

Good catch!

[CptPotato]

I'm not able to reproduce the panic with this fix anymore, thanks 👍

On a side note, I think I misunderstood :earlier and :later. I initially thought they would be identical to undo and redo but they actually work differently. Is this the intended behaviour?

[archseer]

@CptPotato I personally don't use these (though I should try to), but they hook into the undo tree so you're able to go to a version of the document at a specific time (could be on a different undo branch): https://vimtricks.com/p/vimtrick-time-travel-in-vim/

helix/helix-core/src/history.rs

Lines 28 to 32 in d131a9d

	/// Revisions are commited with a timestamp. :earlier and :later can be used
	/// to jump to the closest revision to a moment in time relative to the timestamp
	/// of the current revision plus (:later) or minus (:earlier) the duration
	/// given to the command. If a single integer is given, the editor will instead
	/// jump the given number of revisions in the vector.

[CptPotato]

@CptPotato I personally don't use these (though I should try to), but they hook into the undo tree so you're able to go to a version of the document at a specific time (could be on a different undo branch): https://vimtricks.com/p/vimtrick-time-travel-in-vim/

That's really cool, thank you for elaborating.