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,

src/legacy_app_shell_services.cpp

@@ -4,6 +4,7 @@
 
 #include "app.h"
 #include "app_core/document_import.h"
+#include "legacy_app_dialog_services.h"
 #include "legacy_canvas_view_services.h"
 #include "legacy_document_canvas_services.h"
 #include "legacy_history_services.h"
@@ -190,10 +191,9 @@ public:
 
     void show_message_box() override
     {
-        app_.msgbox = new NodeMessageBox();
-        app_.msgbox->set_manager(&app_.layout);
-        app_.msgbox->init();
-        app_.layout[app_.main_id]->add_child(app_.msgbox);
+        app_.msgbox = pp::panopainter::create_legacy_app_message_dialog(
+            app_,
+            pp::app::plan_main_toolbar_message_dialog()).get();
     }
 
     void show_settings_dialog() override