The accessibility element id is currently the class type, for instance:

QGuiApplication.ApplicationWindow_QMLTYPE_2.Button_QMLTYPE_1

This is:

• Not unique, all buttons have the same id
• Very long
• Exposing uneccesary information (the a11y system needs the role/element type only)

Fix this by (one of)

• Removing the id completely (do we need it?)
• Make it be a generic/unique id, based on interface pointer
• Optionally expose the extra information in a special debug mode.