bug#21028: Performance regression in revision af1a69f4d17a482c359d98c00ef86fac835b5fac (Apr 2014).

[Clément Pit--Claudel]

On 2016-12-18 14:52, Eli Zaretskii wrote:
>> Cc: 21028@debbugs.gnu.org
>> From: Clément Pit--Claudel <clement.pit@gmail.com>
>> Date: Sun, 18 Dec 2016 13:04:09 -0500
>>
>>>   https://debbugs.gnu.org/cgi/bugreport.cgi?bug=21028#98
>>>
>>> Did you try that?  What were the results?
>>
>> Sorry, I missed that message.
>>
>> It works!  But only for the original example (with Arial), AFAICT.  Do you 
>> know what the equivalent fix would be for the recipe given in 
>> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=21028#62 ?
> 
> The same: use :family and :registry instead of :name.  What did you
> try?

I tried this, but it was didn't seem to make a difference:

(dolist (frame (frame-list))
  (dolist (fontset (fontset-list))
    (set-fontset-font fontset 'unicode (font-spec :family "Segoe UI Emoji" 
:registry "iso10646-1") frame 'append)
    (set-fontset-font fontset 'unicode (font-spec :family "XITS Math":registry 
"iso10646-1") frame 'append)))

(setq-default prettify-symbols-alist '(("=>" . 8658) (":=" . 8796)))

> And why does that example use 'format', but without any format spec?

It was a leftover from the code that I started from when trying to construct a 
minimal example.

Clément

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