bug#29325: 26.0.90: Info scrolling stuck

[Eli Zaretskii]

> Date: Thu, 16 Nov 2017 20:41:09 +0100
> From: charles@aurox.ch (Charles A. Roelli)
> 
> I had the following issue under GNU/Linux, but not macOS:
> 
> 1. C-h i
> 2. M-x buffer-face-mode RET (to enable a variable-width font)
> 3. m Info RET
> 4. g Help-Inv RET
> 5. Scroll to the bottom of the buffer with the mouse-wheel, then up again.
> 
> In step 5, I could scroll all the way to the bottom of the buffer (as
> far as scrolling with the mouse wheel brings you), but scrolling back
> to the top of the buffer would get stuck in the middle somewhere.
> Even pressing DEL would not work.

Not reproducible here.  Could be a macOS thing?  Or maybe it depends
on the font used as variable pitch (or its size)?