Re: char-displayable-p returns t for undisplayable characters

[Kenichi Handa]

In article <address@hidden>, Jonathan Yavner <address@hidden> writes:
> When Emacs is running under X11, char-displayable-p says U+221A is present, 
> apparently because I have a font with an ISO-10646 registry, but that font 
> has no drawing for the square-root character.  Arguably, char-displayable-p 
> could try harder to determine whether the char is actually present.
[...]
> The reason for my bug report to emacs-pretest is that kmail does something 
> reasonable for U+221A (substituting the JIS-equivalent character), but Emacs 
> doesn't.  However, since I can't find any other program that does this trick, 
> it seems to be kmail that's the outlier, not Emacs.

FYI, Emacs-unicode (branch emacs-unicode-2) does the same
thing.  For the moment, it doesn't implement
char-displayable-p (which is introduced in HEAD after
emacs-unicode-2 is branched), but implementing it in more
accurate way is easier in this version.

---
Ken'ichi HANDA
address@hidden