Fix for #4227

[softwareCobbler]

Attempted fix for #4227

[jgorene]

Hello there,
I'm following some pull requests to see where I can help to move forward on v4.22.

Edited
My mistake, sorry! I should have first gone to the develop branch and for me this option was fixed fine by @yotamberk, in fact 👍 .
Nevertheless, it would seem that the "toggleRollingMode ()" method still does not work if the "rollingMode" is not defined in the options, at least a priori.

[asiby]

Hi guys. No offence, but I think it would help to just grab the fix from the timeline-plus project that got forked from this one. It is at https://github.com/yotamberk/timeline-plus

They have the rollingMode working just fine.