Correctly maintain app's titlebar name
|Reported by:||joanna||Owned by:||somebody|
|Priority:||major||Milestone:||Release 1 Alpha 2|
When an app changes its title bar contents, the appviewer ignores the change and keep the original name in the title bar. Some apps dynamically remap the title bar names at startup (e.g. Thunderbird, Dolphin), so it would be nice to have it correctly implemented, so that the user see something meaningful in the task bar.