Function register_foldable_view_mode 

pub fn register_foldable_view_mode(registry: &mut ModeRegistry)

Register FoldableViewMode in registry. Called by register_foundation_modes; it must be registered for the implies cascade to pull it in (an unregistered shared minor is logged at debug! and the chord simply does not bind).

Panics

If foldable-view-mode is already registered.