Adding 3rd level hierarchy for nested groups fixing #2846

[Jogai]

fixes #2846

Taken changes from @JobrianTrinidad

[avrahamcool]

any news on this?

[yotamberk]

Hi @Jogai ,
I appreciate the PR, but I cannot accept it like this. You've changed the nestedInGroup property and introduced a breaking change without changing the docs.
You've also applied a lot of spacing changes which make it very difficult to understand the actual changes you've added.
Please add this change to the docs and remove all the spacing so I can add this.

I've also now branched out to a new fork of my own including only Timeline.
If you can reapply the change here: https://github.com/yotamberk/timeline-plus
you will find this fix there within a week or two.

Awesome fix! Thanks for your contribution! Future PRs will be reviewed and added in the new fork

[Jogai]

Thank you for looking into this. I'll see what I can do

[jgorene]

Hi,
Well, I tested "timeline-plus" by @yotamberk to see what it could do...
Good work for this very interesting new feature, thanks to all!
A priori, it works well except to collapse all levels of a group directly from "first level" but maybe I missed something!
This action will be possible after the application of this fix?
Thank you again ;)

[yotamberk]

This has been applied properly in timeline-plus v2.1.8
I've now branched out to a new fork of my own including only Timeline.
I've applied your change here: https://github.com/yotamberk/timeline-plus
and can be used via npm here: https://www.npmjs.com/package/timeline-plus
Awesome fix! Thanks for your contribution! Future PRs will be reviewed and added in the new fork