Ticket #36735: 36735.1.patch

src/wp-includes/js/media-editor.js

@@ -55 +55 @@
                         fallbacks = function( props ) {
                                 // Generate alt fallbacks and strip tags.
                                 if ( 'image' === props.type && ! props.alt ) {
-                                        props.alt = props.caption || props.title || '';
+                                        if( props.caption ) {
+                                                props.alt = props.caption;
+                                        } else if( props.title !== props.url ){
+                                                props.alt = props.title;
+                                        } else {
+                                                props.alt = ''; 
+                                        }
                                         props.alt = props.alt.replace( /<\/?[^>]+>/g, '' );
                                         props.alt = props.alt.replace( /[\r\n]+/g, ' ' );
                                 }
@@ -232 +238 @@
                 image: function( props, attachment ) {
                         var img = {},
                                 options, classes, shortcode, html;
-
+                        
+                        props.type = 'image';
                         props = wp.media.string.props( props, attachment );
                         classes = props.classes || [];