ConstAll popup / disabled behavior is inherited from CommandGroup (the popup panel, allDisabled
gating, float close). This component only computes the active toggle and hands CommandGroup the
projected quickCommand / icon. It renders <CommandGroup> directly (not via the group's
render escape hatch), so wiring this component as a group's render does not recurse.
A CommandGroup over a set of mutually-exclusive toggle commands whose head reflects whichever toggle is currently active (e.g. the underline and text-overflow button groups): the toggle members come from a registered group (
groupKey) or an inlinememberslist, andprojectAspicks how the active toggle surfaces on the head.