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bug#25792: 26.0.50; Scroll-margin working incorrectly when scrolling dow


From: Eli Zaretskii
Subject: bug#25792: 26.0.50; Scroll-margin working incorrectly when scrolling down if show-trailing-whitespace is t
Date: Sun, 19 Feb 2017 22:56:15 +0200

> Date: Sun, 19 Feb 2017 19:20:40 +0200
> From: Eli Zaretskii <address@hidden>
> Cc: address@hidden, address@hidden
> 
> > From: address@hidden
> > Date: Sun, 19 Feb 2017 11:59:22 -0500
> > Cc: address@hidden
> > 
> > > Only scrolling down is affected. The issue first appeared when I
> > > recompiled emacs roughly 1 week ago and has persisted over multiple
> > > recompilations on 2 different laptops (both running Antergos & Xfce), so
> > > my guess is that it's an issue in the current emacs master.
> > 
> > This seems to be caused by [1: b9be4c14e8], it only happens when the
> > window has partial lines (i.e., (zerop (cadr (cl-floor
> > (window-screen-lines)))) is non-nil).  Not sure how
> > show-trailing-whitespace affects this, but it does.
> 
> My guess would be that show-trailing-whitespace causes an additional
> redisplay cycle, due to its post-command-hook.

If you invoke trace-redisplay and then run the recipe, you will see
that there are two kinds of redisplay cycles: one that calls
try_scrolling, the other that doesn't.  So there are 2 different paths
through redisplay, and they don't behave the same under these
conditions.

HTH





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