Don't open editor for system folder after adding/deleting user folder.

Fixes #2530

src/libgui/FWCmdAddObject.cpp

@@ -254,6 +254,11 @@ void FWCmdAddUserFolder::undo()
                                                           m_userFolder));
 }
 
+/* We don't want to display the system folder after we add a user
+   folder, so we just swallow the notify. */
+void FWCmdAddUserFolder::notify()
+{
+}
 
 /********************************************************
  * FWCmdAddLibrary

src/libgui/FWCmdAddObject.h

@@ -67,6 +67,7 @@ public:
 
     virtual void redo();
     virtual void undo();
+    virtual void notify();
 };
 
 /********************************************************

src/libgui/FWCmdDeleteObject.cpp

@@ -174,3 +174,10 @@ void FWCmdRemoveUserFolder::undo()
                                 new addUserFolderEvent(fName, obj->getId(),
                                                        m_userFolder));
 }
+
+
+/* We don't want to display the system folder after we remove a user
+   folder, so we just swallow the notify. */
+void FWCmdRemoveUserFolder::notify()
+{
+}

src/libgui/FWCmdDeleteObject.h

@@ -64,6 +64,7 @@ public:
 
     virtual void redo();
     virtual void undo();
+    virtual void notify();
 };
 
 

src/libgui/FWWindow_editor.cpp

@@ -119,6 +119,8 @@ void FWWindow::openEditorPanel()
 
 void FWWindow::openEditor(FWObject *obj)
 {
+    if (FWBTree().isSystem(obj)) return;
+
     attachEditorToProjectPanel(activeProject());
 
     /*