view rust/Cargo.toml @ 47478:ca8121d26732

dirstate-tree: Keep a counter of descendant nodes that have an entry

… and change the `DirstateMap::has_dir` method to be based on this counter
being non-zero instead of the mere presence of a node.

A node with zero descendent with an entry currently should be removed from
the tree, but soon we’ll make the dirstate track additional nodes.
(Specifically, for non-ignored directories in order to keep track of their
mtime and optimize status by doing fewer `read_dir` calls.)

Differential Revision: https://phab.mercurial-scm.org/D10922

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