>>> "SM" == Stefan Monnier <monnier@iro.umontreal.ca> writes:

   >> I see. What is not clear to me is why these text properties information
   >> gets saved at first hand. I thought it might have to do with emacs
   >> saving mechanism. I recall that saving registers did not cause any
   >> problem, say in GNU emacs 26 (if I recall correctly).

   > It doesn't depend on the version of Emacs, but on the values that happen
   > to be carried in the text-properties of the text you happen to have in
   > your registers.  Packages can put any kinds of values in any kinds of
   > text-properties.


Ok I see, it seems that the culprit would be gnus, because mostly if I
save messages to registers, these call the problems.

Is there a command like: delete all text-properties in buffer or region?



-- 
I strongly condemn Putin's war of aggression against the Ukraine.
I support to deliver weapons to Ukraine's military. 
I support the ban of Russia from SWIFT.
I support the EU membership of the Ukraine.