Request: Multiple iron-lists controlled by the window scroll

[safizn]

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Hi, one of my favorite elements, just one tweak and it will be perfect. Can you add support for multiple scrolling regions that would be controlled by the window main scroll ?

I have lists of 1,000 items in total, each 100 are in one wrapping element (which is used to indicate the header of each list). I would like to be able to scroll down the window and when the wrapping element reaches the top it scrolls the 100 items inside till the end, then the page scrolls till the second wrapping element reaches the top, to begin scrolling it's 100 items. And so on. All controlled by the window scrolling bar. So, there would be no need for the scrolling bar of each list's scrolling area, and it will be hidden. Same on mobile scrolling down would give the user a feeling that it is one long page, rather than separated scroll areas.

Hope my explanation is clear enough to understand the point. I'm unable to achieve this.. If you can guide me on the correct way to do it. Thanks

[safizn]

Currently the iron-lists have scrolling regions controlled separately.

What I wish to have, is something like this:

[blasten]

This is the feature for grouping which is in the backlog https://github.com/PolymerElements/iron-list/issues/10