James McCoy wrote:

> On Sun, Dec 05, 2021 at 07:11:00PM +0000, Bram Moolenaar wrote:
> > 
> > Patch 8.2.3748 (after 8.2.3747)
> > Problem:    Giving an error for an empty sign argument breaks a plugin.
> > Solution:   Do not give an error.
> > Files:      src/sign.c, src/errors.h, src/testdir/test_signs.vim
> 
> Since the error has been reverted, the original issue reported in
> https://github.com/vim/vim/pull/9280 still stands -- this creates a
> highlight group with an empty string for a name.  Should that be
> addressed, as was proposed in the PR?

It should not:

  if (linehl != NULL)
    {
        if (*linehl == NUL)
            sp->sn_line_hl = 0;
        else
            sp->sn_line_hl = syn_check_group(linehl, (int)STRLEN(linehl));
    }

With an empty name the highlight group is reset to zero.

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 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///                                                                      \\\
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