git-branch: rename config vars branch.<branch>.*, too

When renaming a branch, the corresponding config section should
be renamed, too.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

refs.c

@@ -867,6 +867,16 @@ int rename_ref(const char *oldref, const char *newref, const char *logmsg)
 		goto rollback;
 	}
 
+	if (!strncmp(oldref, "refs/heads/", 11) &&
+			!strncmp(newref, "refs/heads/", 11)) {
+		char oldsection[1024], newsection[1024];
+
+		snprintf(oldsection, 1024, "branch.%s", oldref + 11);
+		snprintf(newsection, 1024, "branch.%s", newref + 11);
+		if (git_config_rename_section(oldsection, newsection) < 0)
+			return 1;
+	}
+
 	return 0;
 
  rollback:

t/t3200-branch.sh

@@ -94,6 +94,8 @@ test_expect_failure \
          git-branch r &&
          git-branch -m q r/q'
 
+git-repo-config branch.s/s.dummy Hello
+
 test_expect_success \
     'git branch -m s/s s should work when s/t is deleted' \
        'git-branch -l s/s &&
@@ -104,6 +106,10 @@ test_expect_success \
         git-branch -m s/s s &&
         test -f .git/logs/refs/heads/s'
 
+test_expect_success 'config information was renamed, too' \
+	"test $(git-repo-config branch.s.dummy) = Hello &&
+	 ! git-repo-config branch.s/s/dummy"
+
 test_expect_failure \
     'git-branch -m u v should fail when the reflog for u is a symlink' \
     'git-branch -l u &&