Use custom signals to record previous name

Signed-off-by: Yihe Li <winmikedows@hotmail.com>

launcher/ui/instanceview/InstanceDelegate.cpp

@@ -397,6 +397,7 @@ void ListViewDelegate::setModelData(QWidget* editor, QAbstractItemModel* model,
     // Prevent instance names longer than 128 chars
     text.truncate(128);
     if (text.size() != 0) {
+        emit textChanged(model->data(index).toString(), text);
         model->setData(index, text);
     }
 }