Remove and receive events on nested sortables

[carlos.vara]

If a connected sortable list is placed inside another sortable list, everything works fine, except the remove and receive events.

When an element is moved from the inner list to the outer one, 2 update, 1 remove and 1 receive events are called. This is the expected behavior.

But when an element is moved from the outer list to the inner one, only 1 update event is triggered, and no remove or receive events are called.

[rtwo]

I fixed this one as well.

​https://github.com/jquery/jquery-ui/pull/555

[Martin Hoch]

Sortable: Fixed container change detection. Fixes #5159 - Remove and receive events on nested sortables.

Changeset: b9ef00f0c7fe20980e3811e6622d8e2287e0fbf5

[Martin Hoch]

Sortable: Fixed container change detection. Fixes #5159 - Remove and receive events on nested sortables. (cherry picked from commit b9ef00f0c7fe20980e3811e6622d8e2287e0fbf5)

Conflicts:

ui/jquery.ui.sortable.js

Changeset: c0d0283b3bab4fc211b086aa0fbeaa77aad0ce52