Ticket #39633: 39633.patch

src/wp-admin/includes/misc.php

@@ -788 +788 @@
                                 'text' => sprintf( __( '%s has taken over and is currently editing.' ), $user->display_name )
                         );
 
-                        if ( $avatar = get_avatar( $user->ID, 64 ) ) {
-                                if ( preg_match( "|src='([^']+)'|", $avatar, $matches ) )
-                                        $error['avatar_src'] = $matches[1];
+                        $avatar_url_args = array(
+                                'size' => 64
+                        );
+                        if ( $avatar_url = get_avatar_url( $user->ID, $avatar_url_args ) ) {
+                                $error['avatar_src'] = $avatar_url;
+                                $error['avatar_srcset'] = sprintf('%s 2x', esc_attr( get_avatar_url( $user->ID,
+                                                        array_merge( $avatar_url_args,  array( 'size' => $avatar_url_args['size'] * 2 ) )
+                                                )
+                                        )
+                                );
                         }
 
                         $send['lock_error'] = $error;

src/wp-admin/js/post.js

@@ -200 +200 @@
                                         }
 
                                         if ( received.lock_error.avatar_src ) {
-                                                avatar = $( '<img class="avatar avatar-64 photo" width="64" height="64" alt="" />' ).attr( 'src', received.lock_error.avatar_src.replace( /&amp;/g, '&' ) );
+                                                avatar = $( '<img class="avatar avatar-64 photo" width="64" height="64" alt="" />' )
+                            .attr( 'srcset', received.lock_error.avatar_srcset.replace( /&amp;/g, '&' ) )
+                                                        .attr( 'src', received.lock_error.avatar_src.replace( /&amp;/g, '&' ) );
                                                 wrap.find('div.post-locked-avatar').empty().append( avatar );
                                         }