doc literals: adjacent parens change the meaning of backticks

[ceedubs]

Describe and demonstrate the bug

Backticks are used to indicate code in doc literals, but putting them inside a parenthetical causes them to be treated as ordinary text. Adding a space between the parentheses and the backticks makes them behave as expected, but it shouldn't need to be there.

> {{
( `foo` )

(`foo`)
}}

  Now evaluating any watch expressions (lines starting with `>`)... Ctrl+C cancels.

    1 | > {{
          ⧩
          UntitledSection
            [Paragraph [Word "(", Code (Word "foo"), Word ")"], Paragraph [Word "(`foo`)"]]

Environment (please complete the following information):

• ucm --version fa8fc3aced567b62a1f5bcd4d67b95683b2891a9
• OS/Architecture: x86 NixOS

Additional context

This is very similar to https://github.com/unisonweb/unison/issues/4633

[ceedubs]

Oh this also looks closely related to #4993.

[ceedubs]

Oh actually I think that this is a duplicate of #4777 , which I failed to find when I created this.