A trait for viewers that support zoom operations, but that don't or can't
track their own zoom level. This is mostly intended for higher-level panels
that have one or more Zoomable children, which individually track their own
magnification level. Case-in-point:
cogdebugger.ui.fieldvisualizations.ViewerSuperPanel has one of any
number of subpanels installed at a time, but each subpanel can respond to
zoom changes in its own way and/or maintain its own level of magnification.
A trait for viewers that support zoom operations, but that don't or can't track their own zoom level. This is mostly intended for higher-level panels that have one or more Zoomable children, which individually track their own magnification level. Case-in-point: cogdebugger.ui.fieldvisualizations.ViewerSuperPanel has one of any number of subpanels installed at a time, but each subpanel can respond to zoom changes in its own way and/or maintain its own level of magnification.