dirstate-v2: Reuse existing paths when appending to a data file...
dirstate-v2: Reuse existing paths when appending to a data file
When writing a dirstate in v2 format by appending to an existing data file,
filenames / paths that are borrowed from the previous on-disk representation
can be reused.
Differential Revision:
https://phab.mercurial-scm.org/D11096