Media module installation throws errors if file module is disabled

But we don't want that code running when any module is enabled. We only want it running when the media module is enabled. The problem is that we need some of the logic within field_modules_enabled() to run first, so the newly enabled file field is properly initialized. We could do this by changing to media_modules_enabled() as #4 suggests, but add a check to make sure 'media' is in the list of modules being enabled. But I'm not crazy about that, because it violates the pattern of modules taking care of their own enabling logic within hook_enable(). Basically, a lower weight module should be able to have its own hook_modules_enabled() that runs after the media module is properly enabled.

So what if instead, we keep it as media_enable(), but add this code at the top of it:

field_associate_fields('file');
field_cache_clear();

I'm not even sure if we need the first line, maybe just the second?

Fixed as part of #1086958: Switch from Media Entity to File Entity. See top of project page, however, for warnings about updating to the dev snapshot.