Re: Displaying LRM and RLM

[Jason Rumney]

Eli Zaretskii wrote:
> Does Emacs support display of zero-width characters? should it?
>   

I think the answer to this last questions is yes. Another question is 
HOW should Emacs support zero width characters - should it be stripping 
them before they are sent to the font backend for display, and doing the 
right thing with them itself, or should it be up to the font backends to 
support them?

If it is the latter, I think we need to redesign the font backend API to 
allow extra information to be attached in the encode_char function in 
the backends. Checking just now, we do actually have the information 
that this character is zero-width at that point, but once we have 
returned the encoded glyph, that information is lost.