Upload: Exclude PNG images from scaling after uploading. Fixes a case where resizing a very large PNG may create a scaled image that has smaller dimensions but larger file size than the original.

Fixes #48736.
Built from https://develop.svn.wordpress.org/trunk@46809


git-svn-id: http://core.svn.wordpress.org/trunk@46609 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/image.php

@@ -244,6 +244,9 @@ function wp_create_image_subsizes( $file, $attachment_id ) {
 		$image_meta['image_meta'] = $exif_meta;
 	}
 
+	// Do not scale (large) PNG images. May result in sub-sizes that have greater file size than the original. See #48736.
+	if ( $imagesize['mime'] !== 'image/png' ) {
+
 		/**
 		 * Filters the "BIG image" threshold value.
 		 *
@@ -334,6 +337,7 @@ function wp_create_image_subsizes( $file, $attachment_id ) {
 				}
 			}
 		}
+	}
 
 	// Initial save of the new metadata.
 	// At this point the file was uploaded and moved to the uploads directory

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-46808';
+$wp_version = '5.4-alpha-46809';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.