Add filter to image_resize_dimensions( ) return values

[scottconnerly]

Requesting a filter on the values about to be returned, including access to the function's original arguments.

Use case:
Currently, any cropping happens to images always crops to the top-left corner (0,0). Want to be able to write a plugin that will allow cropping with more options (say, crop out at the middle of the image, etc).

Found #15989 - same use case, he just proposes making it core functionality. Hoping my ticket will be approved as it is less invasive.

If you can provide a patch, I'd be interested. The lack of a filter here is annoying and very much a bug.

It'd be worth using compact() for the 3rd parameter to make it more readable.

now using copact( ), good call.

Is this something that can be addressed for in 3.5? Seems like it fits the focus