Fix #10022: changes from commit a2294e9 caused duplicates in the tag …

…selection list for tags attached to multiple bugs.

core/tag_api.php

@@ -413,7 +413,7 @@ function tag_get_candidates_for_bug( $p_bug_id ) {
 	$t_params = array();
 	if ( 0 != $p_bug_id ) {
 		$t_bug_tag_table = db_get_table( 'mantis_bug_tag_table' );
-		$query = 'SELECT t.id, t.name, t.description FROM ' . 
+		$query = 'SELECT DISTINCT t.id, t.name, t.description FROM ' . 
 				$t_bug_tag_table .
 				 ' t2 LEFT JOIN ' . $t_tag_table . ' t ON t.id = t2.tag_id WHERE NOT bug_id = ' . db_param();			 	
 		$t_params[] = $p_bug_id;