CCDM: v15 router does not execute scroll handlers on popstate events

[manolo]

when there is client-side router in V15, it disables popstate handlers added by flow-client.

There is a hack that restore scroll position on navigation see implementation in https://github.com/vaadin/flow/blob/master/flow-client/src/main/java/com/vaadin/client/ScrollPositionHandler.java#L217

[denis-anisimov]

ScrollIT is disabled because of this issue : https://github.com/vaadin/flow/pull/10512

[denis-anisimov]

Also CustomScrollCallbacksIT is disabled