Widgets and Quick hybrid UI development: Make sure that shortcut handling works

Shortcut Descriptions:

1. Shortcut with Application Context:
   • Widget side: Works in every window of the application, and focus is not required.
   • Quick side: Works in every window of the application, and focus is not required.
2. Shortcut with Window Context:
   • Works only if defined inside the active window.
   • If the shortcut is defined in the widget side, it should work regardless of focus.
   • If the shortcut is defined in the quick side, it should work:
     • When the focus is on the quick view.
     • However, it should not? work when the focus is on a sibling widget.

Suspicious Observations:

1. When the focus is on a sibling widget, the window-context shortcut defined in the sibling quick view does not work.
2. The application-context shortcut defined in the quick side can be activated even when its window is closed. However, the similar shortcut defined in the widget side will not be activated when its window is closed.