ReadonlyconfigOptional ReadonlygetVisibility for a window the pipeline has not been told about yet.
Optional ReadonlynowOptional ReadonlyonReceives every guard event from every layer.
Optional ReadonlyonCalled once when a window crosses the quarantine threshold; kernl revokes it here, before the triggering envelope is dispatched.
Optional ReadonlyonCalled when a window becomes visible; kernl releases the port envelopes kehto held for it here.
Options for createGuardPipeline.