Fix comments getting removed from inside parenthesized strings

[spagh-eddie]

Description

Closes #3756

👋 First PR c:

in this section:

black/src/black/trans.py

Lines 940 to 944 in e7c3368

	if leaf.type == token.STRING:
	string_leaf = Leaf(token.STRING, LL[idx].value)
	LL[lpar_or_rpar_idx].remove() # Remove lpar.
	replace_child(LL[idx], string_leaf)
	new_line.append(string_leaf)

StringParenStripper was getting an input that looks like this:

Line(leaves=[Leaf(LSQB, '['),
             Leaf(LPAR, '('),
             # ⬇️ this leaf's ID is the key of the comment
             Leaf(STRING, '"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"'), 
             Leaf(RPAR, ')'),
             Leaf(COMMA, ','),
             Leaf(RSQB, ']')],
     comments={4348688720: [Leaf(COMMENT, '# aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')]},
     ...
)

and outputting this:

Line(leaves=[Leaf(LSQB, '['),
             # ⬇️ this is a new leaf with a different ID generated by
             # StringParenStripper, but it didn't update the comment key!
             Leaf(STRING, '"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"'),
             Leaf(COMMA, ','),
             Leaf(RSQB, ']')],
     comments={4348688720: [Leaf(COMMENT, '# aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')]},
     ...
)

Checklist - did you ...

• Add an entry in CHANGES.md if necessary?
• Add / update tests if necessary?
• Add new / update outdated documentation?

[github-actions]

diff-shades reports zero changes comparing this PR (59e02d3) to main (e7c3368).

---

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[JelleZijlstra]

Thanks!

[hauntsaninja]

Nice fix, thank you!