Module shield 

The system-gesture / interactive-dismiss shield (docs/cover.md): the registries behind the defers_system_gestures and interactive_dismiss_disabled modifiers. Each mounted modifier pushes an entry while its subtree is alive; the union of entries is the app’s current request.

Gesture deferral flows straight to the backend (Toolkit::defer_system_gestures) on every change. Dismiss-disabled is a query: the cover piece reads it — reactively, via the change [Trigger] — when deciding whether a native back may close it and when patching the presented surface’s isModalInPresentation-style flag.

Functions

deferred_edges

The union of every live deferral request (Edges::NONE when there are none). Untracked.

dismiss_disabled

Whether any live subtree asked to disable interactive dismissal. Reads track the change counter, so a binding re-runs as modifiers mount and unmount.

pop_dismiss_disabled

pop_gesture_deferral

push_dismiss_disabled

Register an interactive-dismiss-disabled request (an interactive_dismiss_disabled subtree mounted). Pair with pop_dismiss_disabled on unmount.

push_gesture_deferral

Register an edge-deferral request (a defers_system_gestures subtree mounted). The backend receives the new union immediately. Pair with pop_gesture_deferral on unmount.