Show an error notification when attempting to save 3MF while editing SLA support points

The notification disappears when it is no longer valid.

src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp

@@ -16,6 +16,7 @@
 #include "slic3r/GUI/GUI_ObjectSettings.hpp"
 #include "slic3r/GUI/GUI_ObjectList.hpp"
 #include "slic3r/GUI/Plater.hpp"
+#include "slic3r/GUI/NotificationManager.hpp"
 #include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/SLAPrint.hpp"
 
@@ -1161,6 +1162,7 @@ void GLGizmoSlaSupports::disable_editing_mode()
         m_c->instances_hider()->show_supports(true);
         m_parent.set_as_dirty();
     }
+    wxGetApp().plater()->get_notification_manager()->close_notification_of_type(NotificationType::QuitSLAManualMode);
 }
 
 

src/slic3r/GUI/Gizmos/GLGizmosManager.cpp

@@ -1147,9 +1147,11 @@ bool GLGizmosManager::is_in_editing_mode(bool error_notification) const
         return false;
 
     if (error_notification)
-        wxGetApp().plater()->get_notification_manager()->push_slicing_error_notification(
-            _u8L("You are currently editing SLA support points. Please, apply or discard "
-                 "your changes first."));
+        wxGetApp().plater()->get_notification_manager()->push_notification(
+                    NotificationType::QuitSLAManualMode,
+                    NotificationManager::NotificationLevel::ErrorNotification,
+                    _u8L("You are currently editing SLA support points. Please, "
+                         "apply or discard your changes first."));
 
     return true;
 }

src/slic3r/GUI/NotificationManager.hpp

@@ -73,7 +73,9 @@ enum class NotificationType
     // Notification that auto adding of color changes is impossible
     EmptyAutoColorChange,
     // Notification emitted by Print::validate
-    PrintValidateWarning
+    PrintValidateWarning,
+    // Notification telling user to quit SLA supports manual editing
+    QuitSLAManualMode
 };
 
 class NotificationManager

src/slic3r/GUI/Plater.cpp

@@ -5418,7 +5418,9 @@ void Plater::export_amf()
 
 void Plater::export_3mf(const boost::filesystem::path& output_path)
 {
-    if (p->model.objects.empty()) { return; }
+    if (p->model.objects.empty()
+     || canvas3D()->get_gizmos_manager().is_in_editing_mode(true))
+        return;
 
     wxString path;
     bool export_config = true;