Fix of #1955 and #1874

src/slic3r/GUI/GUI_Preview.cpp

@@ -365,6 +365,9 @@ void Preview::load_print()
 
 void Preview::reload_print(bool force, bool keep_volumes)
 {
+    if (!IsShown() && !force)
+        return;
+
     if (!keep_volumes)
     {
         m_canvas->reset_volumes();
@@ -372,9 +375,6 @@ void Preview::reload_print(bool force, bool keep_volumes)
         m_loaded = false;
     }
 
-    if (!IsShown() && !force)
-        return;
-
     load_print();
 }