Do not require javascript-enabled clients

A simple submit-button is all that's required to make the branch selector
drop-down work on any client, so lets add one.

Noticed-by: Olivier Ramonat <olivier@ramonat.fr>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.css

@@ -134,6 +134,18 @@ div#sidebar div.infobox select {
 	padding: 0px;
 }
 
+td#branch-dropdown-cell {
+	width: 99%;
+}
+
+input#switch-btn {
+	width: 20px;
+	border: solid 1px #aaa;
+	background-color: #bbb;
+	margin: 2px 0px 0px 0px;
+	padding: 0px;
+}
+
 div#sidebar div.infobox input.txt {
 	width: 100%;
 	border: solid 1px #aaa;

ui-shared.c

@@ -487,9 +487,13 @@ void cgit_print_pageheader(char *title, int show_search)
 		html("<p>\n<h1>branch</h1>\n");
 		html("<form method='get' action=''>\n");
 		add_hidden_formfields(0, 1, cgit_query_page);
+		html("<table class='grid'><tr><td id='branch-dropdown-cell'>");
 		html("<select name='h' onchange='this.form.submit();'>\n");
 		for_each_branch_ref(print_branch_option, cgit_query_head);
 		html("</select>\n");
+		html("</td><td>");
+		html("<input type='submit' id='switch-btn' value='..'>\n");
+		html("</td></tr></table>");
 		html("</form>\n");
 
 		html("<p>\n<h1>search</h1>\n");