Re: Scrolling commands and skipping redisplay, was: Re: emacs rendering comparisson between emacs23 and emacs26.3

[Eli Zaretskii]

> Cc: address@hidden, address@hidden, address@hidden, address@hidden,
>  address@hidden
> From: Dmitry Gutov <address@hidden>
> Date: Sun, 12 Apr 2020 06:07:17 +0300
> 
> On 10.04.2020 18:56, Eli Zaretskii wrote:
> >>> Depends on what you mean by "precision".  They might very well miss
> >>> some parts of the buffer entirely, i.e. never see them on display.
> >>> This may or may not be important, depending on the use case.  An
> >>> editor is not supposed to skip portions of the buffer when scrolling
> >>> continuously.
> >> And that's what my last patch helps it avoid doing, by default.
> > It does?  Then maybe I didn't understand what it does.
> 
> The "else" branch (meaning the new default behavior) makes sure 
> redisplay is never skipped during scrolling commands.

I cannot imagine why would we want to exempt only the scrolling
commands from the input_was_pending trick.  And if we want to exempt
all of them, then isn't that tantamount to just removing that
variable?  And if we remove it, what to do ab out the scenario
described by Stefan in the large comment to that variable?