Fixed an issue where clicking the 'to' return value arrow didn't work.

Author: hzr

src/ecma-debugger/action_handler.js

@@ -34,8 +34,8 @@
 
 window.eventHandlers.click["goto-script-line"] = function(event, target)
 {
-  var script_id = Number(event.target.getAttribute("data-script-id"));
-  var script_line = Number(event.target.getAttribute("data-script-line"));
+  var script_id = Number(event.target.get_attr("parent-node-chain", "data-script-id"));
+  var script_line = Number(event.target.get_attr("parent-node-chain", "data-script-line"));
   window.views.js_source.show_and_flash_line(script_id, script_line);
 };