private void initializeRunningElement(TaskInfo taskInfo) {
		GProgressBar bar = taskInfo.setRunning();
		GTaskMonitor taskMonitor = taskInfo.getScheduledTask().getTaskMonitor();
		taskMonitor.setProgressBar(bar);
		if (taskInfo.getGroup().wasCancelled()) {
			bar.initialize(1);
			bar.setMessage("CANCELLED!");
		}
		runningList.add(taskInfo);
	}
Uses a layered pane to create a "watermark effect" to show when the GTaskManger is suspended.
Ghidra/Framework/Project/src/main/java/ghidra/framework/task/gui/taskview/TaskViewer.java