Whether there is an opportunity to set the display of mistakes as in ale: red symbol which is before the line number with a code mistake?

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There is no built-in opportunity to reach similar visual effect?
I can't understand your question.
The feature is supported by default.
Consider reproduce by use minimal vimrc.
Thanks for the direction for search.
I found a problem - it is the conflict of vim-gitgutter and coc.nvim.
This plug-in works with ale well.
With coc.nvim red arrows just do not appear.: (
小an i ask you to repair this incompatibility?
There is priority for sign on vim recently, but not exists with neovim.
Can't fix for now.
set "diagnostic.signOffset": 9999999 to let coc's sign get higher priority.
Yes, in vim of an arrow are shown in itself.
In nvim they appeared too after I added "diagnostic.signOffset": 9999999 in coc-settings.json
Thanks!
set
"diagnostic.signOffset": 9999999to let coc's sign get higher priority.
Will you add this value as default in coc.vim?
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set
"diagnostic.signOffset": 9999999to let coc's sign get higher priority.