ellipsize first item in multiselect, fix #16174

core/css/multiselect.css

@@ -88,6 +88,7 @@ div.multiselect>span:first-child {
 	overflow: hidden;
 	text-overflow: ellipsis;
 	width: 90%;
+	white-space: nowrap;
 }
 
 div.multiselect>span:last-child {