Ticket #22543: 22543-4.diff

wp-includes/class-wp-image-editor-imagick.php

@@ -38 +38 @@
          * @return boolean
          */
         public static function test( $args = array() ) {
-                if ( ! extension_loaded( 'imagick' ) || ! is_callable( 'Imagick', 'queryFormats' ) )
+                if ( ! extension_loaded( 'imagick' ) || ! class_exists( 'Imagick' ) || ! is_callable( 'Imagick', 'queryFormats' ) )
                         return false;
 
+                if( ( ! isset( $args['mime_type'] ) || $args['mime_type'] == 'image/gif' )  && ! is_callable( $this->image, 'setIteratorIndex' ) )
+                        return false;
+
                 return true;
         }