test-repo/changelog_unreleased/cli/13016.md

Fix --cache set only if with --write or --no-different (#13016 by @Milly)

Do not save formatted cache if without --write option and the file is modifies by prettier.

Before fixed, always save formatted cache if with --cache option. Therefore, unformatted files will never be formatted.

2.7:

> prettier --cache foo.js
# Show formatted contents of `foo.js`.
# Then the cache is created and `foo.js` is flagged as already formatted.

> prettier --cache --write foo.js
foo.js 2ms (cached)
# "... (cached)" means that the file is already formatted and do nothing this time.

2.8:

> prettier --cache foo.js
# Show formatted contents of `foo.js`.

> prettier --cache --write foo.js
foo.js 2ms
# `foo.js` has