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Re: master 40c0124816: Minor improvements to precision scroll interpolat

From: Stefan Monnier
Subject: Re: master 40c0124816: Minor improvements to precision scroll interpolation
Date: Sat, 30 Jul 2022 03:27:44 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

>> --- a/lisp/pixel-scroll.el
>> +++ b/lisp/pixel-scroll.el
>> @@ -759,6 +759,9 @@ It is a vector of the form [ VELOCITY TIME SIGN ]."
>>    (interactive "e")
>>    (when pixel-scroll-precision-use-momentum
>>      (let ((window (mwheel-event-window event))
>> +          ;; The animations are smoother if the GC threshold is
>> +          ;; reduced for the duration of the animation.
>> +          (gc-cons-threshold (* gc-cons-threshold 3))
>>            (state nil))
> I don't think it is safe to multiply gc-cons-threshold without some
> kind of limitation from above: the user or some Lisp program could
> have increased the threshold already to a large value.

And I also suspect the above won't be "sufficient" when the heap is
large, because in that case `gc-cons-threshold` doesn't have any effect
any more and it's `gc-cons-percentage` that matters instead.

Maybe binding `gc-cons-percentage` to something like the 1.0 value we
now use in batch mode (or rather to (max 1.0 gc-cons-percentage)) would
be a better option.


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