closes #3203

public/src/modules/composer/tags.js

@@ -36,6 +36,9 @@ define('composer/tags', function() {
 		var input = postContainer.find('.bootstrap-tagsinput input');
 		input.autocomplete({
 			delay: 100,
+			open: function() {
+				$(this).autocomplete('widget').css('z-index', 20000);
+			},
 			source: function(request, response) {
 				socket.emit('topics.searchTags', {query: request.term, cid: postData.cid}, function(err, tags) {
 					if (err) {