private void setStale(boolean stale) {
		if (stale) {
			refreshAction.getToolBarData().setIcon(REFRESH_ICON);
		}
		else {
			refreshAction.getToolBarData().setIcon(REFRESH_NOT_NEEDED_ICON);
		}
	}
A variable used to restrict open-ended operations, like expanding all nodes or filtering.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/calltree/CallTreeProvider.java