Desktop: Accessibility: Add a menu item that moves focus to the note viewer (#11967)

packages/app-desktop/gui/NoteEditor/commands/focusElementNoteViewer.ts

@@ -0,0 +1,22 @@
+import { CommandRuntime, CommandDeclaration } from '@joplin/lib/services/CommandService';
+import { _ } from '@joplin/lib/locale';
+import { FocusElementOptions } from '../../../commands/focusElement';
+import { WindowCommandDependencies } from '../utils/types';
+
+export const declaration: CommandDeclaration = {
+	name: 'focusElementNoteViewer',
+	label: () => _('Note viewer'),
+	parentLabel: () => _('Focus'),
+};
+
+export const runtime = (dependencies: WindowCommandDependencies): CommandRuntime => {
+	return {
+		execute: async (_context: unknown, options?: FocusElementOptions) => {
+			await dependencies.editorRef.current.execCommand({
+				name: 'viewer.focus',
+				value: options,
+			});
+		},
+		enabledCondition: 'markdownEditorVisible',
+	};
+};