refs: honor REFSPEC_SHORTHAND for multi-segment refs by roberth · Pull Request #7148 · libgit2/libgit2

GIT_REFERENCE_FORMAT_REFSPEC_SHORTHAND is documented to "interpret the
name as part of a refspec in shorthand form so the ONELEVEL naming rules
aren't enforced and 'master' becomes a valid name."

However, the multi-segment pseudoref check was not respecting this flag,
rejecting valid refspecs like "A/b" and "HEAD/feature" even when
SHORTHAND was set.

The single-segment check at line 1015 already honors this flag. This
change makes the multi-segment check at line 1021 consistent with that
behavior and with the documented intent.

Git itself accepts these refspec patterns without issue.