private void internalCancel() {
		if (monitorComponent.isCancelled()) {
			return;
		}

		// mark as cancelled; the task will terminate and the callback will dismiss this dialog
		monitorComponent.cancel();
	}
Returns true if this dialog was ever made visible
@return true if shown
Ghidra/Framework/Docking/src/main/java/ghidra/util/task/TaskDialog.java