Make shortcuts active in the entire window by default.
If shortcuts are active only in the widget and children which is their parent, they can only be activated if that widget has focus. Users expect shortcuts to be active when the render window doesn't have focus, like after a filter is created or clicked on in the pipeline window.
Modify the point picking helper to check if the mouse is inside the render window before performing a pick - other shortcuts that depend on the mouse position should follow this pattern.
Also enable the first widget's shortcuts when changing views, and include those widgets selected using a vtkSMProxyListDomain.
Fix #21701 (closed)