Alexander Larsson ce9d889436 Change how ChangesDirs() works
Rather than scan the files in the old directory twice to detect the
deletions we now scan both directories twice and then do all the
diffing on the in-memory structure.

This is more efficient, but it also lets us diff more complex things
later that are not exact on-disk trees.
Upstream-commit: 727e7fcccadf1d3e286f5a3c8d1aa388f6b4dab8
Component: engine
2013-09-30 17:35:01 -06:00
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