Merge pull request #1589 from Trial97/instance_reload

Fully reload the instance list once the folder is changed

launcher/InstanceList.cpp

@@ -823,6 +823,9 @@ void InstanceList::on_InstFolderChanged([[maybe_unused]] const Setting& setting,
         }
         m_instDir = newInstDir;
         m_groupsLoaded = false;
+        beginRemoveRows(QModelIndex(), 0, count());
+        m_instances.erase(m_instances.begin(), m_instances.end());
+        endRemoveRows();
         emit instancesChanged();
     }
 }