view docs/tutorial/.netlify @ 6788:0674b56d3526 stable

topic: drop oldbranchmap context manager, _topiccache is now a mixin

I think this hack was needed back then in d49f75eab6a3 because _topiccache was
a subclass of branchmap.branchcache directly, but now it's a mixin. In any
case, I didn't see any failures in the tests, so it should be fine.

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