describe: do not use unannotated tag even if exact match
4d23660e (describe: when failing, tell the user about options that work, 2009-10-28) forgot to update the shortcut path where the code detected and used a possible exact match. This means that an unannotated tag on HEAD would be used by 'git describe'. Guard this code path against the new circumstances, where unannotated tags can be present in ->util even if we're not actually planning to use them. While there, also add some tests for --all. Reported by 'yashi' on IRC. Signed-off-by: NThomas Rast <trast@student.ethz.ch> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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