Auto-scrolling fix for Catalina - pull request review

[Robert Vehse]

Hello,

I merged PR 11

 I've been testing PR 12 and it works well. I'll merge it today if nobody objects.

Cheers,
Robbie


> Am 20.10.2019 um 02:11 schrieb Robert Vehse <robertvehse at fastmail.fm>:
> 
> Hi everyone,
> 
> In my email regarding codesigning from two days ago I mentioned work being done to fix an issue with auto-scrolling on Catalina.
> 
> Pull requests have now been created:
> - https://bitbucket.org/adium/adium/pull-requests/11 "Update JVMarkedScroller to use public APIs to determine scroller direction"
> - https://bitbucket.org/adium/adium/pull-requests/12 "Adjust auto-scroll code to use more compatible APIs, adding support for macOS Catalina"
> 
> It would be great if someone could review the changes.
> 
> Cheers,
> Robbie