Ticket #27009: 27009-01.patch

src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js

@@ -498 +498 @@
         var parent,
                         node = event.target;
 
-                if ( node.nodeName === 'IMG' && ( parent = editor.dom.getParent( node, '.wp-caption' ) ) ) {
+                if ( node.nodeName === 'IMG' && ( parent = editor.dom.getParent( node, '.wp-caption' ) && event.width > 0 ) ) {
                         editor.dom.setStyle( parent, 'width', 10 + event.width + 'px' );
                 }
     });