The checked member of group in root's tree, or null — the question an
application actually asks a radio group.
Takes any node of the tree, like focusedWidget: the walk starts at
the scope root, so checkedRadio(anyRadio, "quality") and
checkedRadio(scene, "quality") answer the same.
The checked member of
groupinroot's tree, ornull— the question an application actually asks a radio group.Takes any node of the tree, like focusedWidget: the walk starts at the scope root, so
checkedRadio(anyRadio, "quality")andcheckedRadio(scene, "quality")answer the same.