ref-filter: sort detached HEAD lines firstly

Before this patch, "git branch" would put "(HEAD detached...)" and "(no
branch, rebasing...)" lines before all the other branches *in most
cases* except for when using Chinese-language messages. zh_CN generally
uses a full-width "(" symbol (codepoint FF08) to match the full-width
proportions of Chinese characters, and the translated strings we had did
use them. This meant that the detached HEAD line would appear after all
local refs and even after the remote refs if there were any.

AFAIK, it is sometimes not jarring to see the half-width parenthesis in
"full-width" text as in the CJK languages, for instance when there are
no characters preceding or following the parenthesized text fragment. By
removing the parenthesis from the localizable text, we can share strings
with wt-status.c and remove a cautionary comment to translators.

Remove the ( from the localizable portion of messages so the sorting
happens properly regardless of locale.

Helped-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Helped-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Matthew DeVore <matvore@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

ref-filter.c

@@ -1441,35 +1441,35 @@ char *get_head_description(void)
 	struct wt_status_state state;
 	memset(&state, 0, sizeof(state));
 	wt_status_get_state(the_repository, &state, 1);
+
+	/*
+	 * The ( character must be hard-coded and not part of a localizable
+	 * string, since the description is used as a sort key and compared
+	 * with ref names.
+	 */
+	strbuf_addch(&desc, '(');
 	if (state.rebase_in_progress ||
 	    state.rebase_interactive_in_progress) {
 		if (state.branch)
-			strbuf_addf(&desc, _("(no branch, rebasing %s)"),
+			strbuf_addf(&desc, _("no branch, rebasing %s"),
 				    state.branch);
 		else
-			strbuf_addf(&desc, _("(no branch, rebasing detached HEAD %s)"),
+			strbuf_addf(&desc, _("no branch, rebasing detached HEAD %s"),
 				    state.detached_from);
 	} else if (state.bisect_in_progress)
-		strbuf_addf(&desc, _("(no branch, bisect started on %s)"),
+		strbuf_addf(&desc, _("no branch, bisect started on %s"),
 			    state.branch);
 	else if (state.detached_from) {
 		if (state.detached_at)
-			/*
-			 * TRANSLATORS: make sure this matches "HEAD
-			 * detached at " in wt-status.c
-			 */
-			strbuf_addf(&desc, _("(HEAD detached at %s)"),
-				state.detached_from);
+			strbuf_addstr(&desc, HEAD_DETACHED_AT);
 		else
-			/*
-			 * TRANSLATORS: make sure this matches "HEAD
-			 * detached from " in wt-status.c
-			 */
-			strbuf_addf(&desc, _("(HEAD detached from %s)"),
-				state.detached_from);
+			strbuf_addstr(&desc, HEAD_DETACHED_FROM);
+		strbuf_addstr(&desc, state.detached_from);
 	}
 	else
-		strbuf_addstr(&desc, _("(no branch)"));
+		strbuf_addstr(&desc, _("no branch"));
+	strbuf_addch(&desc, ')');
+
 	free(state.branch);
 	free(state.onto);
 	free(state.detached_from);

wt-status.c

@@ -1628,9 +1628,9 @@ static void wt_longstatus_print(struct wt_status *s)
 			} else if (s->state.detached_from) {
 				branch_name = s->state.detached_from;
 				if (s->state.detached_at)
-					on_what = _("HEAD detached at ");
+					on_what = HEAD_DETACHED_AT;
 				else
-					on_what = _("HEAD detached from ");
+					on_what = HEAD_DETACHED_FROM;
 			} else {
 				branch_name = "";
 				on_what = _("Not currently on any branch.");

wt-status.h

@@ -65,6 +65,9 @@ enum wt_status_format {
 	STATUS_FORMAT_UNSPECIFIED
 };
 
+#define HEAD_DETACHED_AT _("HEAD detached at ")
+#define HEAD_DETACHED_FROM _("HEAD detached from ")
+
 struct wt_status_state {
 	int merge_in_progress;
 	int am_in_progress;