Allow user remapping of "repeat last insert"

[eugenesvk]

As far as I understand, there is no "repeat last command" command, you must use the default . keybind

I'd like to move this command to a different key, so I'd need a repeat_last_command command I could use

[archseer]

For historical reasons this is currently a builtin

helix/helix-term/src/ui/editor.rs

Lines 730 to 738 in a2fad4f

	// special handling for repeat operator
	key!('.') if self.keymaps.pending().is_empty() => {
	// first execute whatever put us into insert mode
	self.last_insert.0.execute(cxt);
	// then replay the inputs
	for &key in &self.last_insert.1.clone() {
	self.insert_mode(cxt, key)
	}
	}

but since macros don't have this limitation and also do a similar thing I think it should be possible to refactor this into a command now 👍🏻

[rcorre]

A side-effect of this is that you can't map anything else to .

[NikitaRevenco]

It looks like to easily implement this we also need #5555 to be resolved, see this comment