Merge pull request #2337 from skttl/U4-10549-rte-memory-usage

Fix for U4-10549 RTE memory usage

src/Umbraco.Web.UI.Client/src/common/directives/components/grid/grid.rte.directive.js

@@ -366,6 +366,9 @@ angular.module("umbraco.directives")
                             // element might still be there even after the modal has been hidden.
                             scope.$on('$destroy', function () {
                                 unsubscribe();
+								if (tinyMceEditor !== undefined && tinyMceEditor != null) {
+									tinyMceEditor.destroy()
+								}
                             });
 
                         });

src/Umbraco.Web.UI.Client/src/views/propertyeditors/rte/rte.controller.js

@@ -374,6 +374,9 @@ angular.module("umbraco")
                 // element might still be there even after the modal has been hidden.
                 $scope.$on('$destroy', function () {
                     unsubscribe();
+					if (tinyMceEditor !== undefined && tinyMceEditor != null) {
+						tinyMceEditor.destroy()
+					}
                 });
             });
         });