BEFORE-event args for the board/host WidgetSubmitting output — raised after a
widget's MJWhiteboard.submit payload passed validation (marker + tracked source +
size cap) but BEFORE it is surfaced through WidgetSubmitted. Handlers run
synchronously; set Cancel to true to drop the submission (no WidgetSubmitted
fires and nothing reaches the agent/consumer).
BEFORE-event args for the board/host
WidgetSubmittingoutput — raised after a widget'sMJWhiteboard.submitpayload passed validation (marker + tracked source + size cap) but BEFORE it is surfaced throughWidgetSubmitted. Handlers run synchronously; set Cancel totrueto drop the submission (noWidgetSubmittedfires and nothing reaches the agent/consumer).