[Bug: 21.4.21] another Mule+x-symbol corruption

[Stephen J. Turnbull]

David Kastrup writes:

 > preview-latex does not even touch the buffer text or encoding [...].
 > 
 > And AUCTeX only does user-initiated and user-visible changes.
 > 
 > So it is really just X-Symbol that is prone to mangling files in its
 > normal course of operation if things go wrong.

Thank you for the polite clarification.  Feel free to LART me if I
forget in the future. ;-)