bug#23861: 25.1.50; fast-but-imprecise-scrolling: What does "somewhat inaccurate" mean?

[Stefan Kangas <stefan@marxist.se>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Phil Sainty <psainty@orcon.net.nz>
>> Date: Wed, 29 Jun 2016 01:03:00 +1200
>>
>> It's unclear to me what the following excerpt from the docstring
>> for the `fast-but-imprecise-scrolling' variable actually means:
>>
>>  > Note that this optimization can cause the portion of the buffer
>>  > displayed after a scrolling operation to be somewhat inaccurate.
>>
>> "somewhat inaccurate" is incredibly vague if you don't already
>> know what it means.
>
> It means that what's on the screen might not reflect what's in the
> buffer.
>
> It's hard to tell anything more specific, since which redisplay
> optimizations will be taken in each case depends on many factors on
> which the user has no control.
>
>> Does it mean that the position scrolled to might be further (or
>> less far) than it would have been otherwise?
>
> It could.
>
>> Does it mean that the font-locking may be incomplete or incorrect?
>
> It could.
>
>> Does it mean that the buffer text may appear corrupted?!
>
> It could, if faces change the font size.

That was 3 years ago.  It doesn't look like there is anything more to do
here, so I'm closing this bug report.

Please reopen the bug if that's incorrect.

Best regards,
Stefan Kangas