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I think everyone knows that vim can't display multiline messages in quickfix (yes, I know that it can parse them and show them as one big line). I thought about ways to workaround this and thought what if vim can wrap lines at arbitrary characters, I know it can wrap lines that are longer than number current screen. Maybe it can be done with arbitrary lines? If it would be so I could insert some characters instead of newlines in multiline messages so that vim would break lines at this characters.

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The linebreak option instructs vim to wrap at the characters specified in the breakat option (by default spaces and a handful of punctuation characters). You can choose some "harmless" control character. For example, ^Y or control+Y

set wrap linebreak
exe "set breakat=\<c-y>"

will turn

I think everyone knows that vim can't display^Ymultiline messages in quickfix

(visually) into

I think everyone knows that vim can't display^Y
multiline messages in quickfix

This introduces the problem that <c-y> is visible as ^Y. For this you could use vim's conceal feature.

syn match QFBreak /\%o31/ conceal cchar=↲
set cole=2

To completely hide the character, use set cole=3 instead.

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    This will only break if the line isn't fitted on the screen. I'm talking about breaking it even if it fits the screen. – user1685095 Aug 28 '17 at 21:26
  • Ah, okay. I don't know personally, but hopefully someone else has a solution. – Mass Aug 29 '17 at 1:06
  • I don't have high hopes on that. Since this would be a nice workaround for multiline quickfix problem and I never heard of it. – user1685095 Aug 29 '17 at 10:07

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