Ticket #45083: 45083.patch

src/wp-includes/widgets/class-wp-widget-media-image.php

@@ -67 +67 @@
                                 'size'              => array(
                                         'type'        => 'string',
                                         'enum'        => array_merge( get_intermediate_image_sizes(), array( 'full', 'custom' ) ),
-                                        'default'     => 'medium',
+                                        'default'     => get_option( 'image_default_size', 'medium' ),
                                         'description' => __( 'Size' ),
                                 ),
                                 'width'             => array( // Via 'customWidth', only when size=custom; otherwise via 'width'.