Theme preview doesn't return theme to normal when delete name with Alt-Backspace

[h1t]

Summary

The theme preview when using :theme will keep the previewed theme if you delete name of theme using Alt-Backspace keys.
But if you delete name of theme by repeating Backspace key, then previewed theme return to normal.

Reproduction Steps

I tried this:

1. hx

I expected this to happen:

Instead, this happened:

Helix log

~/.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

Platform

macOS

Terminal Emulator

alacritty 0.12.0 (5a72819)

Helix Version

23.03-29-g3dd715a1

[the-mikedavis]

We should call the prompt's update callback for all of these keymaps that change the prompt's line the same way as we currently do for regular Backspace:

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

Lines 513 to 522 in 76825c7

	ctrl!('w') | alt!(Backspace) | ctrl!(Backspace) => {
	self.delete_word_backwards(cx.editor)
	}
	alt!('d') | alt!(Delete) | ctrl!(Delete) => self.delete_word_forwards(cx.editor),
	ctrl!('k') => self.kill_to_end_of_line(cx.editor),
	ctrl!('u') => self.kill_to_start_of_line(cx.editor),
	ctrl!('h') | key!(Backspace) | shift!(Backspace) => {
	self.delete_char_backwards(cx.editor);
	(self.callback_fn)(cx, &self.line, PromptEvent::Update);
	}