Walkthrough panning still problematic

[ghost]

@bhousel Great that you've worked on the walkthrough!

I'm afraid #2386 isn't yet fixed though.

Screencast of latest Firefox on Linux, 52.0.2. I had the same with Brave (which is based on Chromium).

Somtimes even the shrinkwrapping effect misses the City Hall, and focuses on another place. That happens quite often, but strangely never while I'm making a screencast*.

Other stages of the walkthrough also have this issue.

---

*This is not an attempt to be funny, I literally mean this.
I tried 20+ times to reproduce it while screencasting, but never succeeded.
Without screencasting, window at same size: 4/10 times glitched.
Procedure: start walkthrough from welcome screen, pan, observe effect, Ctrl+R, repeat.

[bhousel]

I can see from the screenshot that you're still testing with the old walkthrough code. The new walkthrough is on #3921, which has not merged to master yet.

You can test the code on that branch by using the Runnable link (see first comment on that PR):
test link: http://265ykk-id-runnable-staging-openstreetmap.runnableapp.com:8080/

Please let me know if that works for you, and put your comments on #3921, thanks! Hoping to merge in the next day or so..

[ghost]

Great! I saw the PR in the list but totally forgot that green=open, purple=merged, I always found that very confusing on GitHub. Sorry for the noise!