Re: Bidirectional editing in Emacs -- main design decisions

[Jason Rumney]

Eli Zaretskii wrote:
> 4. Reordering of text for display
>   

Does the function font-shape-gstring help with fitting this in?

> 8. User control of visual order
>   
>  I decided it was unjustified to deviate from UAX#9.  Its algorithm
>  already provides the solution to this problem: users can always
>  control the visual order by inserting special formatting codes at
>  strategic places.

Couldn't Emacs by default use the clever heuristics to decide when to 
automatically insert the special formatting codes? It would have to be 
optional and undoable of course, because heuristics are never perfect, 
but it seems to me as a naive non-speaker of RTL languages that to DWIM 
in these edge cases is the right behaviour.

Also you mention several times that the special direction change codes 
are not displayed, but there should be an option to display them IMHO, 
(perhaps part of whitespace.el) as users may need to distinguish between 
explicit direction changes and implicit ones in some circumstances.