fix "maximum call stack size exceeded" error with rich text editor

src/Squidex/app/framework/angular/forms/control-errors.component.ts

@@ -60,10 +60,7 @@ export class ControlErrorsComponent extends StatefulComponent<State> implements
 
     public ngOnDestroy() {
         super.ngOnDestroy();
-
+		this.restoreOriginalMarkAsTouchedFunction();
-        if (this.control && this.originalMarkAsTouched) {
-            this.control['markAsTouched'] = this.originalMarkAsTouched;
-        }
     }
 
     public ngOnChanges() {
@@ -87,6 +84,7 @@ export class ControlErrorsComponent extends StatefulComponent<State> implements
 
         if (this.control !== control) {
             this.unsubscribeAll();
+			this.restoreOriginalMarkAsTouchedFunction();
 
             this.control = control;
 
@@ -112,6 +110,12 @@ export class ControlErrorsComponent extends StatefulComponent<State> implements
         this.createMessages();
     }
 
+	private restoreOriginalMarkAsTouchedFunction() {
+		if (this.control && this.originalMarkAsTouched) {
+			this.control['markAsTouched'] = this.originalMarkAsTouched;
+		}
+	}
+
     private createMessages() {
         const errors: string[] = [];