Desktop: Multiple window support (#11181)

Co-authored-by: Laurent Cozic <laurent22@users.noreply.github.com>

packages/app-desktop/commands/openNoteInNewWindow.ts

@@ -0,0 +1,36 @@
+import { CommandRuntime, CommandDeclaration, CommandContext } from '@joplin/lib/services/CommandService';
+import { _ } from '@joplin/lib/locale';
+import { stateUtils } from '@joplin/lib/reducer';
+import Note from '@joplin/lib/models/Note';
+import { createAppDefaultWindowState } from '../app.reducer';
+import Setting from '@joplin/lib/models/Setting';
+
+export const declaration: CommandDeclaration = {
+	name: 'openNoteInNewWindow',
+	label: () => _('Edit in new window'),
+	iconName: 'icon-share',
+};
+
+let idCounter = 0;
+
+export const runtime = (): CommandRuntime => {
+	return {
+		execute: async (context: CommandContext, noteId: string = null) => {
+			noteId = noteId || stateUtils.selectedNoteId(context.state);
+
+			const note = await Note.load(noteId, { fields: ['parent_id'] });
+			context.dispatch({
+				type: 'WINDOW_OPEN',
+				noteId,
+				folderId: note.parent_id,
+				windowId: `window-${noteId}-${idCounter++}`,
+				defaultAppWindowState: {
+					...createAppDefaultWindowState(),
+					noteVisiblePanes: Setting.value('noteVisiblePanes'),
+					editorCodeView: Setting.value('editor.codeView'),
+				},
+			});
+		},
+		enabledCondition: 'oneNoteSelected',
+	};
+};