Re: bidi-display-reordering is now non-nil by default

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Cc: address@hidden
> Date: Sat, 27 Aug 2011 22:52:00 -0400
> 
> >> So embeddings should not be used too much, and/or should only be used
> >> dynamically (jit-lock-style) and implicitly (e.g. not copied by
> >> kill-region).
> > It depends.  If only part of the embedded text is copied, then the
> > directional formats should be dropped, indeed.  But if all of it is
> > copied, they should be kept, to preserve the visual appearance.
> 
> Sounds difficult to implement reliably.

What difficulties do you have in mind?

> > So I guess we will need to set filter-buffer-substring-functions to
> > something non-nil by default?  Or maybe modify filter-buffer-substring
> > itself to remove these characters as needed?
> 
> Maybe that can be made to work, but we'd need to add a corresponding
> filter-substring

What for? strings aren't copied by C-w and friends.

> and I'm not sure that we wouldn't get into bugs where we need to
> change the code from buffer-substring to filter-buffer-substring.

Which bugs, and why will we get into them?