Image dimensions are not saved correctly after rotate

Problem

When the image is rotated the new image dimensions are not saved (in fact 2 notices are triggered).

This due accessing the wrong paramaters of the $image object:

    $new_file->image_dimensions['width'] = $image->width;
    $new_file->image_dimensions['height'] = $image->height;

Proposed resolution

Fix the access to the properties:

    $new_file->image_dimensions['width'] = $image->info['width'];
    $new_file->image_dimensions['height'] = $image->info['height'];