LocalFilesystemAdapter. Call clearstatcache in several methods

[pvandommelen]

Php's statcache caches the results of some file functions like is_file or filesize.

For the visibility() method, a clearstatcache is already used to clear this cache, but this is not the case for several other methods.

Fixes #1826

[frankdejonge]

Can you add a configuration option to opt-in to this behaviour?

[pvandommelen]

Thanks for the quick reply! Do we really have to have a configuration option for this?

clearstatcache is already used in the visibility method, which would probably also be affected by such an option. Something similar is also implemented in ensureDirectoryExists.

As mentioned in the issue, this commit would mostly reapply an older fix (6f2211c). Though that's on a much older release.

If you'd still like a configuration option, I can add one. But I think we should then move the existing clearstatcache calls behind that check.