Desktop: Multiple window support (#11181)

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

packages/app-desktop/gui/WindowCommandsAndDialogs/commands/showModalMessage.ts

@@ -0,0 +1,16 @@
+import { CommandDeclaration, CommandRuntime, CommandContext } from '@joplin/lib/services/CommandService';
+
+export const declaration: CommandDeclaration = {
+	name: 'showModalMessage',
+};
+
+export const runtime = (): CommandRuntime => {
+	return {
+		execute: async (context: CommandContext, message: string) => {
+			context.dispatch({
+				type: 'SHOW_MODAL_MESSAGE',
+				message,
+			});
+		},
+	};
+};