Reset cutoff when cutoff section is destroyed

REDMINE-20674

entry_types/scrolled/package/spec/editor/models/Cutoff-spec.js

@@ -0,0 +1,22 @@
+import {useEditorGlobals, useFakeXhr} from 'support';
+import '@testing-library/jest-dom/extend-expect';
+
+describe('Cutoff', () => {
+  useFakeXhr();
+
+  const {createEntry} = useEditorGlobals();
+
+  it('resets metadata configuration when deleting the cutoff section', () => {
+    const entry = createEntry({
+      metadata: {configuration: {cutoff_section_perma_id: 100}},
+      sections: [
+        {id: 1, permaId: 100},
+        {id: 2, permaId: 101},
+      ]
+    });
+
+    entry.sections.get(1).destroy();
+
+    expect(entry.metadata.configuration.get('cutoff_section_perma_id')).toBeUndefined();
+  });
+});

entry_types/scrolled/package/src/editor/models/Cutoff.js

@@ -7,6 +7,12 @@ export const Cutoff = Object.extend({
     this.listenTo(this.entry.metadata.configuration,
                   'change:cutoff_section_perma_id',
                   () => this.trigger('change'));
+
+    this.listenTo(this.entry.sections, 'destroy', (section) => {
+      if (this.isAtSection(section)) {
+        this.reset();
+      }
+    });
   },
 
   isEnabled() {

entry_types/scrolled/package/src/editor/models/ScrolledEntry/index.js

@@ -13,7 +13,6 @@ import {deleteContentElement} from './deleteContentElement';
 export const ScrolledEntry = Entry.extend({
   setupFromEntryTypeSeed(seed) {
     this.consentVendors = new ConsentVendors({hostMatchers: seed.consentVendorHostMatchers});
-    this.cutoff = new Cutoff({entry: this});
 
     this.contentElements = new ContentElementsCollection(seed.collections.contentElements);
     this.sections = new SectionsCollection(seed.collections.sections,
@@ -25,6 +24,8 @@ export const ScrolledEntry = Entry.extend({
 
     this.sections.sort();
 
+    this.cutoff = new Cutoff({entry: this});
+
     editor.failures.watch(this.contentElements);
     editor.failures.watch(this.sections);
     editor.failures.watch(this.chapters);