Focus generalizes bottom lexical and top fullTree parametres to a spine around the cursor #459
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This ports the "focus" interface of the CodeActionContributor to all the other on-demand language services: Referrer, Documenter, Definer, ...
alias Focus = list[Tree]and document itFocusinstead ofTree lexical, Tree fullTreeTreeSearchinstead ofTreeAdapter.findLexicalAtIn this PR we will keep the test and demo code as-is, in order to prove backward compatibility without introducing many duplicate tests. In a later PR when this has stabilized, we can replace both the demos and the tests with the new interface. Due to the compatibility layer, the existing tests will generate full code coverage of the new functionality.