Ticket #29275: 29275.patch

src/wp-includes/js/media-views.js

@@ -5344 +5344 @@
                                 width = this.$el.width();
 
                         if ( width ) {
-                                this.columns = Math.round( width / this.options.idealColumnWidth ) || 1;
+                                this.columns = Math.min( Math.round( width / this.options.idealColumnWidth ), 12 ) || 1;
 
                                 if ( ! prev || prev !== this.columns ) {
                                         this.$el.attr( 'data-columns', this.columns );