Applying changes in image editor loses meta data for any additional image sizes

[prettyboymp]

When using the image editor, the wp_save_image function only generates images for the core image sizes and ignores any of the theme registered images sizes. This causes the full sized image to be used everywhere that the custom image size is called in the theme.

[prettyboymp]

Reproduction steps:

1. add add_image_size('test-300x300', 300, 300, true); to functions.php in theme
2. upload an new image through the media library
3. check the meta values for the uploaded image

//current meta for media
   meta_id: 3508
   post_id: 42756
  meta_key: _wp_attachment_metadata
meta_value: a:6:{s:5:"width";i:3072;s:6:"height";i:2304;s:14:"hwstring_small";s:23:"height='96' width='128'";s:4:"file";s:20:"2012/08/IMG_0969.jpg";s:5:"sizes";a:5:{s:9:"thumbnail";a:3:{s:4:"file";s:20:"IMG_0969-150x150.jpg";s:5:"width";i:150;s:6:"height";i:150;}s:6:"medium";a:3:{s:4:"file";s:20:"IMG_0969-300x225.jpg";s:5:"width";i:300;s:6:"height";i:225;}s:5:"large";a:3:{s:4:"file";s:21:"IMG_0969-1024x768.jpg";s:5:"width";i:1024;s:6:"height";i:768;}s:12:"test-300x300";a:3:{s:4:"file";s:20:"IMG_0969-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;}s:14:"post-thumbnail";a:3:{s:4:"file";s:20:"IMG_0969-624x468.jpg";s:5:"width";i:624;s:6:"height";i:468;}}s:10:"image_meta";a:10:{s:8:"aperture";d:2.7999999999999998;s:6:"credit";s:0:"";s:6:"camera";s:21:"Canon PowerShot SD750";s:7:"caption";s:0:"";s:17:"created_timestamp";i:1333862434;s:9:"copyright";s:0:"";s:12:"focal_length";d:5.7999999999999998;s:3:"iso";s:3:"200";s:13:"shutter_speed";d:0.016666666666666666;s:5:"title";s:0:"";}}

4. click edit image and apply a crop
5. check the meta values for the image, note that the meta for the 'test-300x300' image is missing for the current '_wp_attachment_metadata' metakey

//new meta values for the image:
   meta_id: 3508
   post_id: 42756
  meta_key: _wp_attachment_metadata
meta_value: a:6:{s:5:"width";i:952;s:6:"height";i:960;s:14:"hwstring_small";s:22:"height='96' width='95'";s:4:"file";s:35:"2012/08/IMG_0969-e1344353338375.jpg";s:5:"sizes";a:2:{s:9:"thumbnail";a:3:{s:4:"file";s:35:"IMG_0969-e1344353338375-150x150.jpg";s:5:"width";i:150;s:6:"height";i:150;}s:6:"medium";a:3:{s:4:"file";s:35:"IMG_0969-e1344353338375-297x300.jpg";s:5:"width";i:297;s:6:"height";i:300;}}s:10:"image_meta";a:10:{s:8:"aperture";d:2.7999999999999998;s:6:"credit";s:0:"";s:6:"camera";s:21:"Canon PowerShot SD750";s:7:"caption";s:0:"";s:17:"created_timestamp";i:1333862434;s:9:"copyright";s:0:"";s:12:"focal_length";d:5.7999999999999998;s:3:"iso";s:3:"200";s:13:"shutter_speed";d:0.016666666666666666;s:5:"title";s:0:"";}}
*************************** 3. row ***************************
   meta_id: 3509
   post_id: 42756
  meta_key: _wp_attachment_backup_sizes
meta_value: a:6:{s:9:"full-orig";a:3:{s:5:"width";i:3072;s:6:"height";i:2304;s:4:"file";s:12:"IMG_0969.jpg";}s:14:"thumbnail-orig";a:3:{s:4:"file";s:20:"IMG_0969-150x150.jpg";s:5:"width";i:150;s:6:"height";i:150;}s:11:"medium-orig";a:3:{s:4:"file";s:20:"IMG_0969-300x225.jpg";s:5:"width";i:300;s:6:"height";i:225;}s:10:"large-orig";a:3:{s:4:"file";s:21:"IMG_0969-1024x768.jpg";s:5:"width";i:1024;s:6:"height";i:768;}s:17:"test-300x300-orig";a:3:{s:4:"file";s:20:"IMG_0969-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;}s:19:"post-thumbnail-orig";a:3:{s:4:"file";s:20:"IMG_0969-624x468.jpg";s:5:"width";i:624;s:6:"height";i:468;}}

At this point the full size image gets pulled in anywhere that thumbnail size is used.

[SergeyBiryukov]

Introduced in [18996].

#19889 also has a patch, going to close as a duplicate of that ticket.