Something strange happened when using auto completion

[WindSoilder]

Reproduction steps

Sorry for that I don't know how to describe it in a good way, you can look the upload video please.

It seems that when I:

1. type os.read_ and then
2. delete two character os.rea and then
3. select the auto completion item, the result is os.rearead, which should be os.read

2021-10-21.10.00.48.mov

Environment

• Platform: macOS
• Helix version: v0.4.1-248-g0fa8baf

~/.cache/helix/helix.log

please provide a copy of `~/.cache/helix/helix.log` here if possible, you may need to redact some of the lines

[archseer]

I think this is 4) here: #822

It's likely got something to do with the hack we do here

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

Lines 127 to 139 in b1ebd7a

	// if more text was entered, remove it
	// TODO: ideally to undo we should keep the last completion tx revert, and map it over new changes
	let cursor = doc
	.selection(view.id)
	.primary()
	.cursor(doc.text().slice(..));
	if trigger_offset < cursor {
	let remove = Transaction::change(
	doc.text(),
	vec![(trigger_offset, cursor, None)].into_iter(),
	);
	doc.apply(&remove, view.id);
	}

[archseer]

Should be fixed in 3edca78