On 02/23/2016 11:57 AM, Eli Zaretskii wrote:
>> Cc: emacs-devel@gnu.org
>> From: Clément Pit--Claudel <clement.pit@gmail.com>
>> Date: Mon, 22 Feb 2016 12:28:13 -0500
>>
>> (with-current-buffer (get-buffer-create "temp")
>>   (erase-buffer)
>>   (setq-default prettify-symbols-unprettify-at-point 'right-edge)
>>   (emacs-lisp-mode)
>>   (prettify-symbols-mode)
>>   (insert "lambda\n\nlambda")
>>   (pop-to-buffer (current-buffer)))
>>
>> Moving around in this buffer unprettifies and reprettifies ‘lambda’s into ‘λ’s as the point moves in and out of them. Setting ‘font-lock-fontified’ to nil breaks that mechanism (the ‘λ’s are unprettified but no reprettified), and no series of ‘font-lock-flush’ and ‘font-lock-ensure’ will reprettify them.
>>
>> Does this help?
> 
> Yes, thanks.  I will look into this soon.

Great; thank you very much. Let me know if I can help!