@Override
		public boolean isStartDragOk(List<GTreeNode> dragUserData, int dragAction) {
			for (GTreeNode node : dragUserData) {
				if (node instanceof NodeWithText) {
					return true;
				}
			}
			return false;
		}
This spacer addresses the optical impression that the message panel changes size when showing details
Ghidra/Framework/Docking/src/main/java/docking/ErrLogExpandableDialog.java