Invoke handler not receiving Javascript messages

[ssmith22]

Using Ubuntu 18.04. After the latest upgrade the webview handler no longer receives Javascript messages.

These new libraries might be the culprits:

No error or complication issues show up. Confirmed using webview-examples.

[jeffparsons]

Probably related: #280

[jeffparsons]

@ssmith22 I've just confirmed that the fix from #280 works for me on Ubuntu 20.10, after having the equivalent OS package update break it for me today.

[ssmith22]

Thanks! The script fix didn't work for me, but changing the invoke line based on the linked slask question did. Ie: window.webkit.messageHandlers.external.postMessage(JSON.stringify(arg));