interfaces: add a Protocol class for `scmutil.status`...
interfaces: add a Protocol class for `scmutil.status`
I initially tried moving this to the `interfaces` package, both to have more
cleanly defined interfaces (interfaces shouldn't have to reach into
implementation files for their type info), and because importing `mercurial.ui`
either directly or indirectly into `interfaces.repository` causes a situation
where pytype stops inferring the type for `revlogutils.constants` that are
imported by `revlog`. (Likely this is caused by a cycle. The `dirstate`
interface already imports `scmutil`, which in turn imports `ui`, so the
`repository` interface module importing the `dirstate` interface module as part
of converting those classes to Protocol classes will trigger the issue.)
I gave up on moving the class because `scmutil.status` depends on `stringutil`,
which has a surprisingly long tail of dependencies. In any event, a standalone
Protocol class might help with the Rust code.
