view .clang-format @ 39179:1c3184d7e882

dagop: extract headsetofconnecteds() from dagutil

The functionality for resolving the set of DAG heads from a
subset simply requires a function to resolve parent revisions.

Let's establish a function in the dagop module to do this, which
seems to be where generic DAG functionality goes these days.

Differential Revision: https://phab.mercurial-scm.org/D4327

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