On Thu, Nov 14, 2019 at 9:41 PM Fu Yuan <casouri@gmail.com> wrote:
>
> I noticed that the 'category property is not copied along when I copy and
paste a text button. Is this expected? Why is that?

yank-excluded-properties is a variable defined in ‘simple.el’.
Its value is
(category field follow-link fontified font-lock-face help-echo intangible
invisible keymap local-map mouse-face read-only yank-handler)

  You can customize this variable.


This variable was introduced, or its default value was changed, in
version 24.3 of Emacs.
  Probably introduced at or before Emacs version 22.1.

Documentation:
Text properties to discard when yanking.
The value should be a list of text properties to discard or t,
which means to discard all text properties.

See also ‘yank-handled-properties’.