signin or signup in twitter webapp fails as the buttons are actionless

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1183475

Couple of interesting things to note. If you open Browser app and go to twitter.com you can login as sergio points out. However you can't scroll at all in the main twitter view of tweets. Not sure if this is related at all, but seems webkit is having troubles with this site in general.

I can reliably reproduce when running the app on the desktop:

 - launch `webbrowser-app http://mobile.twitter.com` → the signup and signin buttons work
 - launch `webbrowser-app --chromeless http://mobile.twitter.com` → the signup and signin buttons don’t work

I suspect an invisible mouse area at the bottom of the window is in the way, eating click events. Investigating.

I introspected the app while running with and without chrome, and it turns out that when run chromeless, the Panel, even though invisible because it has no contents, is in state "spread", so it’s eating mouse events.

The proper fix would probably involve moving the Panel component inside the Loader, so that it’s not instantiated at all when in chromeless mode.

A less invasive fix could be to explicitly set panel.opened to false when the source of the Loader is unset (the problem happens because browser.chromeless is initially false, so the chrome component is initially loaded for a brief moment at startup, and then unloaded as browser.chromeless is changed to true).

> However you can't scroll at all in the main twitter view of tweets.
> Not sure if this is related at all, but seems webkit is having
> troubles with this site in general.

Not related to this specific bug. This is being tracked by bug #1130087.

Fix committed into lp:webbrowser-app at revision 143, scheduled for release in webbrowser-app, milestone ubuntu-13.04-month-5