Closes https://github.com/microsoft/playwright/issues/32070. We were
applying `additionalFileMatcher` not just to `filteredProjectSuites`,
but also to `projectSuites`. `projectSuites` is where we take dependency
projects from, though - so `--only-changed` led to empty dependency
projects, resulting in the reported bug.
The fix is to only apply `additionalFileMatcher` on
`filteredProjectSuites`.
Introduces an `--only-changed [base ref]` option.
`playwright test --only-changed` filters the test run to only run test
suites that have uncommitted changes.
`playwright test --only-changed=foo` runs only tests that were changed
since commit `foo`.
In pull request CI, this can be used to run changed tests first and fail
fast: `--only-changed=$GITHUB_BASE_REF`.
During local development, it can be used to quickly filter down to the
touched set of tests suites.
In some rare usecases, this can also help to cut down on CI usage for
pull requests. Tread with caution though.
File dependencies are taken into account to ensure that if you touched a
utility file, all relevant tests are still executed.
Closes https://github.com/microsoft/playwright/issues/15075
