Custom cropping in image-edit.php doesn't work with custom image sizes

[mau]

Custom (manual) cropping in image-edit.php doesn't work with custom image sizes (sizes added via add_image_size).

​wp-admin/includes/image-edit.php#L606
There's an 'intermediate_image_sizes' filter hook where default image sizes are hard-coded in an array.
Sure you can add your own custom sizes to the array via this filter but it seems to me that having to use the filter every time you use add_image_size() doesn't feel right. Especially when the radio button below says: "Apply changes to: All image sizes".

I believe it could be fine to replace the 'intermediate_image_sizes' filter with call to ​get_intermediate_image_sizes() function.
This would not break the filtering ability the hook provided as the same hook is used in the mentioned function as well.

How do you feel about it?

This is the very first patch proposal in my life. Please be kind. I'm sorry if I misunderstood something.

[nacin]

This patch looks sane. Given that this code is even running the function's filter, there should be limited side effects.

[nacin]

Looks like this was simply missed in [12659].

[nacin]

In [18996]:

Use get_intermediate_image_sizes() in image edit functions. props mau, fixes #17475.