Subject: bug#22090: Isearch is sluggish and eventually refuses further service with "[Too many words]".

From: Eli Zaretskii <[email-masked]>
Date: Fri, 04 Dec 2015 20:48:23 +0200

> Date: Fri, 4 Dec 2015 16:37:08 +0000
> From: Artur Malabarba <[email-masked]>
> Cc: [email-masked], Alan Mackenzie <[email-masked]>
> 
> > What about ligatures, or symbols like ℻?
> 
> Won't match cross-case. 

So f will match ﬃ but not ℻, and F will match ℻ but not ﬃ, is that
right?

> > Also, by "lower-case equivalent" do you mean a case mapping defined by
> > the UCD
> 
> Yes. Visual appearance is irrelevant. 
> 
> Strictly speaking, to match a general character, you need to search for its
> decomposition. If this character also has a case "equivalent" (as per
> current-case-table), you can also search for the decomposition of this
> equivalent. 

OK, thanks.  I will try to think if this needs to be explained in the
manual.