Always hide cut/copy/paste menu in the notebooks (microsoft#208297)

* Include execution count in notebook diff

* Fix tests

* Misc changes

* Fix tests

* Fix more tests

* Always hide cut/copy/paste menu in the notebooks

Author: DonJayamanne

src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts

@@ -41,7 +41,7 @@ import { SuggestController } from 'vs/editor/contrib/suggest/browser/suggestCont
 import * as nls from 'vs/nls';
 import { MenuId } from 'vs/platform/actions/common/actions';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
-import { IContextKey, IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
+import { IContextKey, IContextKeyService, RawContextKey } from 'vs/platform/contextkey/common/contextkey';
 import { IContextMenuService } from 'vs/platform/contextview/browser/contextView';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 import { ServiceCollection } from 'vs/platform/instantiation/common/serviceCollection';
@@ -102,6 +102,7 @@ import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
 import { OutlineTarget } from 'vs/workbench/services/outline/browser/outline';
 import { PixelRatio } from 'vs/base/browser/pixelRatio';
 import { ICodeEditorService } from 'vs/editor/browser/services/codeEditorService';
+import { PreventDefaultContextMenuItemsContextKeyName } from 'vs/workbench/contrib/webview/browser/webview.contribution';
 import { NotebookAccessibilityProvider } from 'vs/workbench/contrib/notebook/browser/notebookAccessibilityProvider';
 
 const $ = DOM.$;
@@ -420,6 +421,8 @@ export class NotebookEditorWidget extends Disposable implements INotebookEditorD
 		this._outputInputFocus = NOTEBOOK_OUPTUT_INPUT_FOCUSED.bindTo(this.scopedContextKeyService);
 		this._editorEditable = NOTEBOOK_EDITOR_EDITABLE.bindTo(this.scopedContextKeyService);
 		this._cursorNavMode = NOTEBOOK_CURSOR_NAVIGATION_MODE.bindTo(this.scopedContextKeyService);
+		// Never display the native cut/copy context menu items in notebooks
+		new RawContextKey<boolean>(PreventDefaultContextMenuItemsContextKeyName, false).bindTo(this.scopedContextKeyService).set(true);
 
 		this._editorEditable.set(!creationOptions.isReadOnly);