Louis D'hauwe 876682fb12 [SourceKit] Add "Active Regions" request ...

`source.request.activeregions` is a new request that reports all
`#if`, `#else` and `#elseif` decls in the response with an `is_active` flag.
This is mainly useful for a client to know which branches are active,
but for completeness sake, the active decls are also reported.

Note: it only reports the positions of the decls, not the entire ranges.
It's up to clients to map this to the syntactic structure of a tree.
Reporting the ranges of the decls could be confusing in the case
of nested `#if`s, where the ranges can overlap.

2023-03-01 14:13:58 -08:00

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