> On 23/03/2025 7:41, Eli Zaretskii wrote:
>>> Environment
>>>
>>> Emacs 30.1 on Windows 10.
>>
>> I confirm the issue in Emacs 30.  But when I try this in Emacs 31,
>> Emacs crashes.  The backtrace is below.  Cecilio, could you please
>> look at this?

I can reproduce the original bug, but not the crash.  Anyway, it seems 
to happen because some glyph index is outside of the font range, so this 
patch should fix the crash.