Fix parsing of double-quoted values with backslash continuations

[felipecrs]

Describe the pull request

When UnescapeValueDoubleQuotes is enabled, the parser now correctly handles multiline double-quoted values that contain backslash line continuations. Previously, it would incorrectly stop at intermediate quotes before a continuation, causing key-value delimiter not found errors.

The fix checks if a line ends with a backslash after finding a closing quote, and continues reading if so, ensuring the actual closing quote is found.

Fixes parsing of values like:

# ~/.gitconfig

[alias]
hello = "!f() { \
  echo "hello world"; \
};f"

Link to the issue: n/a

Checklist

• [x] I agree to follow the Code of Conduct by submitting this pull request.
• [x] I have read and acknowledge the Contributing guide.
• [x] I have added test cases to cover the new code.

[felipecrs]

Hi @unknwon, apologies for the ping.

I know the project has been quiet, and I'm not requesting a review. I just wanted to ask whether this PR (or any other one) has any chance of being merged.

It fixes an important issue for me, and I'm trying to decide whether I should wait or consider maintaining a fork.

Thank you.

[unknwon]

Hey @felipecrs, thanks for the ping! I might be able to give a human-review some time this week, but can't commit on a timeline due to holiday travels!

[felipecrs]

Thanks a lot, @unknwon!