Ctrl+\ wrongly recognised as invalid

[leg100]

Describe the bug
VHS recognises the control sequence Ctrl+\ as invalid, but I think it should be valid.

Setup

• Arch
• Bash
• Kitty

To Reproduce

cat > vhs.tape
Ctrl+\

vhs vhs.tape
File: vhs.tape
  1 │ Ctrl+\
          ^ Not a valid modifier

  1 │ Ctrl+\
          ^ Invalid control argument: +

  1 │ Ctrl+\
           ^ Expected control character with args, got \

parser: 3 error(s)
recording failed

Expected behavior
Expect VHS to not report any errors and to submit the control sequence to terminal.

[Delta456]

Where is Ctrl+\ used?

[leg100]

Where is Ctrl+\ used?

It's used in my Bubbletea app to clear a selection.

[Delta456]

@meowgorithm should we support this?

[sevenc-nanashi]

Bumping this.
I'm trying to use asciinama with vhs, and it requires Ctrl+\.