QDS text editor in Design mode removes the auxiliary data

While editing the nodes the text editor in design view should preserve the aux data.

In the current behavior, the aux data is either partly removed or messed up.

Steps to reproduce.

• Import UI using Asset importer. The QML files generated should have UUIDs in aux data.
• Remove a couple of nodes and save the file.
• The aux data is removed.

Similar behavior is displayed when reparenting or moving nodes.

See the attached video.