FIX: Open provided file at startup (#11419)

src/slic3r/GUI/Plater.cpp

@@ -5105,14 +5105,19 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
                     return;
                 }
             }
+
             try {
                 if (originfile != "<lock>") // see bbs_3mf.cpp for lock detail
                     boost::filesystem::remove_all(last);
             }
+
             catch (...) {}
-            int skip_confirm = e.GetInt();
-            this->q->new_project(skip_confirm, true);
-            });
+            
+            if (this->q->get_project_filename().IsEmpty() && this->q->is_empty_project()) {
+                int skip_confirm = e.GetInt();
+                this->q->new_project(skip_confirm, true);
+            }
+        });
         //wxPostEvent(this->q, wxCommandEvent{EVT_RESTORE_PROJECT});
     }
 
@@ -15078,6 +15083,9 @@ void Plater::export_toolpaths_to_obj() const
     p->preview->get_canvas3d()->export_toolpaths_to_obj(into_u8(path).c_str());
 }
 
+bool Plater::is_empty_project() {
+    return model().objects.empty();
+}
 bool Plater::is_multi_extruder_ams_empty()
 {
     std::vector<std::string>        extruder_ams_count_str = p->config->option<ConfigOptionStrings>("extruder_ams_count", true)->values;