Let transfer_rotation_to_content affect Annotations

[JayBraker]

Explanation

I read up on a couple of old issues referencing transfer_rotation_to_content as well as Annotations an came to the conclusion that this seems to be an egde-case issue: When applying the page's rotation onto contents, any Annotation will be unaffected - messing up their visual context.

Now I am not entirely literate within the PDF spec but from what I've seen, every annotation contains a Rect?

If this makes sense, I would like to propose/contribute also transforming any annotations accordingly (seems pretty straight forward based on how "/MediaBox", "/CropBox", "/BleedBox", "/TrimBox", "/ArtBox" are transformed).

A little background on our usecase: We are presented a couple PDFs which have been scanned (for some reason a couple of scanners apply 270 degree visual rotations to make the scan look portrait-like) and immediately annotated.
Now as we need to further process the files and add watermarks or similar alterations, it has become painful to align the scan+annotations with any new content.
Amending the transfer_rotation_to_content should be a great relief.

Thank you for looking into this, I would be happy to dedicate my time to making this change happen - I wanted to discuss this issue as maybe there is a good reason why annotations are not transformed right now.

Kind Regards, Josha

[stefan6419846]

As far as I am aware, only markup annotations have a rectangle, although some might have additional relevant aspects like PolyLine with its vertices. This probably needs to be taken into account as well.

Speaking of transfer_rotation_to_content: Is this the only case where annotation transformations are not supported? What is the current state for the other transformations - do they affect annotations as well and should they affect annotations? Should we enforce this to the user or make this optional?