tests: show how the dirstate can end up containing wrong information...
tests: show how the dirstate can end up containing wrong information
which can result in bad status output.
Concretely, this seems to be easily triggered by having a build system
watching the filesystem for changes, and rebuilding files that are
both tracked and generated while an update is happening.
Differential Revision:
https://phab.mercurial-scm.org/D6474
