Add an early return filter for get_upload_dir()

[mattwiebe]

Our use of wp_upload_dir() in Activitypub\get_upload_baseurl() was creating PHP warnings on dotcom due to its internal use of wp_mkdir_p() which fails there.

Fixes #

Proposed changes:

• add a pre_activitypub_get_upload_baseurl filter to bypass the use of wp_upload_dir()

[pfefferle]

@mattwiebe you also have to add the changelog entry to the readme.txt, then the tests are green!

[mattwiebe]

@mattwiebe you also have to add the changelog entry to the readme.txt, then the tests are green!

It does not like me 😆

[mattwiebe]

We could also probably just scrap the regular filter entirely. I doubt anyone was using it, since it was just for us.

[pfefferle]

It seems that you accidentally bring back a lot of readme stuff!

I quickly fixed it

[mattwiebe]

I quickly fixed it

Thanks! The conflict resolution thing here was acting all kinds of weird for me