Plan main toolbar message dialog

src/app_core/main_toolbar.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "app_core/app_dialog.h"
 #include "app_core/document_canvas.h"
 #include "app_core/history_ui.h"
 #include "foundation/result.h"
@@ -59,6 +60,14 @@ public:
     virtual void show_settings_dialog() = 0;
 };
 
+[[nodiscard]] inline AppMessageDialogPlan plan_main_toolbar_message_dialog()
+{
+    return plan_app_message_dialog(
+        "Just a test message",
+        "Longer description for the error or the message.",
+        true);
+}
+
 [[nodiscard]] inline pp::foundation::Result<MainToolbarPlan> plan_main_toolbar_command(
     MainToolbarCommand command,
     int undo_count = 0,