mu4e: row and column numbers of errors displayed are wrong

[rdiaz02]

Same issue (regarding wrong column and row numbers) as in emacs-grammarly/flycheck-grammarly#13. This also happens with flymake-languagetool.

This is a screenshot:

[mavit]

I don't use mu4e, but I wonder if this is related to text properties, in which case #19 might help. Could you try it?

[kennyballou]

Can confirm this does not appear to be an issue anymore.