Search widget is broken
If a Search widget is added to a Fusion layout as a toolbar button, the button does not show up on the toolbar.
This is because the widget fails to declare itself as a UI object.
Once that is fixed, the button shows up, but when it is clicked none of the widget settings are picked up by the php script that gets invoked.
This happens because the script tries to look up the widget based on its ID, but it has no ID configured.