private void runNextTaskIfNotBusy() {
		if (runningTask != null) {
			return;
		}
		if (processNextTaskInPriorityQ()) {
			return;
		}

		processNextTaskGroup();

		processNextTaskInPriorityQ();
	}
Cancels all scheduled groups and tasks. The TaskMonitor for
the currently running task will be cancelled, but the task will continue to run until it
checks the monitor.
Ghidra/Framework/Project/src/main/java/ghidra/framework/task/GTaskManager.java