Re: emacs rendering comparisson between emacs23 and emacs26.3

[Richard Stallman]

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  > > 
  > >   > Recent Emacsen either ignore that variable or silently reset it to nil
  > >   > internally so it doesn't get into their way.  Their progmodes either
  > >   > always scan an entire buffer from its beginning or use some elaborate,
  > >   > fragile techniques to find such a top level position.  Moreover, our
  > >   > underlying mechanism for syntax highlighting always marks the entire
  > >   > rest of a buffer as dirty after every single editing change.  This has
  > >   > the consequence that that entire part has to be continuously rescanned
  > >   > when some of it is shown in another window.
  > > 
  > > Does anyone disagree with this specific factual claim?

  > I'm not sure what is "the claim" here,

The factual statements in the paragraph I quoted, above.

                                           but I want to point out a small
  > inaccuracy: redisplay doesn't "continuously rescan the entire rest of
  > the buffer", it only rescans the part(s) shown in windows.  (It might
  > happen that some major mode's font-lock definitions end up rescanning
  > much more, but that's a separate issue.)

Isn't that separate issue the issue we are talking about.

                                              And frankly, what would we
  > like Emacs to do instead?

It would scan only from the last open-paren-in-column-zero, as it did
in the past.

                               A change in a buffer can potentially affect
  > the fontification of the rest of the buffer, and I don't think we
  > would like Emacs to fail to update other windows showing the same
  > buffer

I have a feeling there has been a change of topic here, but I can't be
sure.

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)