Issue #11729: Preselect next highest status in bug_change_status

The bug change status dropdown list currently preselects the
first/lowest status as the default. It would be more useful if the
default value selected was the next highest status from the current
status. Failing that (for closed issues) we should revert back to using
the highest available status as the default.

core/html_api.php

@@ -1351,11 +1351,20 @@ function html_button_bug_change_status( $p_bug_id ) {
 
 	if( count( $t_enum_list ) > 0 ) {
 
-		# resort the list into ascending order after noting the key from the first element (the default)
-		$t_default_arr = each( $t_enum_list );
-		$t_default = $t_default_arr['key'];
+		# resort the list into ascending order
 		ksort( $t_enum_list );
+
+		# Get the default selected option as the next highest available status
+		# Otherwise fall back to using the last element in the array
+		end( $t_enum_list );
+		$t_default = key( $t_enum_list );
 		reset( $t_enum_list );
+		foreach( $t_enum_list as $key => $val ) {
+			if( $key > $t_bug_current_state ) {
+				$t_default = $key;
+				break;
+			}
+		}
 
 		echo "<form method=\"post\" action=\"bug_change_status_page.php\">";
 		# CSRF protection not required here - form does not result in modifications