I did not understand the question. My blocks look like this:
I am not using "window.AppInventor.setWebViewString ()" in the script. I display the result of the script in the application using "document.write (outapp);". The data "\xc4\x85" passes to the "webviewstring" block from the text field.
It seems to me the problem is with passing a variable to "webviewstring". Is not shipped what I would expect?
You can test this script here: