bug#14771: 24.3.50; Unable to scroll one line at time at window edges.

[Eli Zaretskii]

> Date: Tue, 02 Jul 2013 10:32:28 -0700
> From: Keith David Bershatsky <esq@lawlist.com>
> 
> Within a recent revision to the Emacs Trunk (probably the last month or so), 
> the default behavior of scrolling one line at a time when reaching the window 
> edges (top / bottom) was disabled.  (setq scroll-step 1) does not fix this.  
> Setting scroll-conservatively to a high number works only with the down arrow 
> key, but the up arrow key causes emacs to temporarily freeze when reaching 
> the top window edge -- i.e., the dreaded spinning wheel on OSX.

Setting scroll-step to 1 does what I expect for me, and so does
setting scroll-conservatively to a large number.  However, I don't
have access to OSX to test there.  (These features work on
display-independent level, though, so I'm unsure how a different
system can explain the problems.)

Can you show a minimal recipe, starting from "emacs -Q", to reproduce
this?