bug#13949: 24.4.1; `fill-paragraph' should not always put the buffer as modified

[Óscar Fuentes]

Eli Zaretskii <eliz@gnu.org> writes:

> Thanks, but I'm not sure computing the hash is enough: the functions
> involved in refilling can change text properties, so the test should
> also account for that.

The docs say:


  This shows two dashes (‘--’) if the buffer displayed in the window has
  the same contents as the corresponding file on the disk; i.e., if the
  buffer is unmodified.



AFAIK, a file-visiting buffer is not marked as modified when text
properties are applied to it. This makes sense, because text properties
are not part of the contents of the corresponding file.