* When the group mode is enabled, the focus movement will be limited to the child actors
* of the current focus group including the current focus group itself. The current focus
* group is the closest ancestor of the current focused actor that set as a focus group.
* When the group mode is enabled, the focus movement will be limited to the child actors
* of the current focus group including the current focus group itself. The current focus
* group is the closest ancestor of the current focused actor that set as a focus group.