Merge branch 'kb/co-orphan-suggestion-short-sha1'

Update the informational message when "git checkout" leaves the
detached head state.

* kb/co-orphan-suggestion-short-sha1:
  checkout: abbreviate hash in suggest_reattach

builtin/checkout.c

@@ -729,7 +729,7 @@ static void suggest_reattach(struct commit *commit, struct rev_info *revs)
 			"If you want to keep them by creating a new branch, "
 			"this may be a good time\nto do so with:\n\n"
 			" git branch new_branch_name %s\n\n"),
-			sha1_to_hex(commit->object.sha1));
+			find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
 }
 
 /*