bug#14598: 24.3; global-hl-line-mode + text-scale-adjust + next-line + scrolling

[E Sabof]

> At the moment I'm a bit confused as to how auto-window-vscroll works right
> now. I might try to dig a bit deeper at some point, and put together a
> prototype of how I think it should work.

What do you mean by "how auto-window-vscroll works"?  If you mean how
its value is taken into account, look at line-move-partial.  If you
mean anything else, please ask.

No, I've found the relevant source. I just want to test different scenarios, and 

see how it behaves in each one of them.