@Override
				public Dimension getPreferredSize() {
					Dimension dim = super.getPreferredSize();
					dim.height = 400;
					dim.width = 800; // trial and error?
					return dim;
				}
This spacer addresses the optical impression that the message panel changes size when showing details
Ghidra/Framework/Docking/src/main/java/docking/ErrLogExpandableDialog.java