@Override
		public void suspendedStateChanged(boolean isSuspended) {
			SystemUtilities.runSwingLater(() -> {
				layeredPane.invalidate();
				layeredPane.repaint();
			});
		}
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