Keep opacity in current item in newFileMenu

Whenever the input field appears, the menu item should keep its opacity
instead of reacting on hover.

apps/files/css/files.css

@@ -746,6 +746,10 @@ table.dragshadow td.size {
 	margin: 0;
 }
 
+.newFileMenu.popovermenu a.menuitem.active {
+	opacity: 1;
+}
+
 .newFileMenu.bubble:after {
 	left: 75px;
 	right: auto;

apps/files/js/newfilemenu.js

@@ -84,6 +84,8 @@
 				OC.hideMenus();
 			} else {
 				event.preventDefault();
+				this.$el.find('.menuitem.active').removeClass('active');
+				$target.addClass('active');
 				this._promptFileName($target);
 			}
 		},