@Override
	public void addException(String message, Throwable t) {

		int n = errors.size();
		if (n > MAX_EXCEPTIONS) {
			return;
		}

		errors.add(t);
		root.addNode(new ReportExceptionNode(t));
		updateTitle(); // signal the new error
	}
This spacer addresses the optical impression that the message panel changes size when showing details
Ghidra/Framework/Docking/src/main/java/docking/ErrLogExpandableDialog.java