emoji_support contains bad content where there is a literal string about yamlfmt HOT 3 CLOSED

Sorry, I should not use \n in literal string qaq

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I notice you've closed it now, but here's what I've got about the issues with the output just to keep track.

Of the 3 issues with the output:

• Double quotes around the result
  • This is from the yaml library. I haven't yet thought of a context free way to get rid of these due to the way they are added into the formatted output, but I'm experimenting with solutions.
• Outputting to a single line
  • This is also from the library, and this one I'm not sure why it does that. It's possible the yaml.Node serialization doesn't retain the | multiline literal syntax information.
• The trailing n
  • This was a bug with emoji_support in 0.5.0 that I fixed in #55 and will be in version 0.6.0

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Haha I also found the issue and it should advance one byte to check 'U'.

Besides I figure it out why it always formats to a single line since it considers emoji is not printable, so the text contains special characters and always output to escaped one line instead of multi-line literal string or simple string.

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