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This PR addresses #425 allowing use of DND inside shadow roots e.g. in used in
Web Components. It does not cover drag&drop between different shadow roots.
Approach:
instead of event.target (since event.target points just to the shadow root
host).
the event source instead of the document. This is encapsulated in
queryElements in current query-selector-all.js replacing the former query
function while also integrating the filter logic. The logic is called recursively.
shadow root. Built-in styles need to be added to the shadow root. This can be
done by allows consumers to specify the DOM location as a
stylesInsertionPoint prop on the DragDropContext. Similar approach is taken
by JSS (see https://cssinjs.org/jss-api?v=v10.6.0#setup-jss-instance).
Open points:
This is a port of a PR in the forked source repository which was not merged: atlassian/react-beautiful-dnd#2319