private AddressSetView getDiffHighlightBlock() {
		if (diffControl == null) {
			return new AddressSet();
		}
		Address p1DiffAddress = diffControl.getCurrentAddress();
		Address p2DiffAddress = SimpleDiffUtility.getCompatibleAddress(primaryProgram,
			p1DiffAddress, secondaryDiffProgram);
		AddressRange range = p2DiffHighlight.getRangeContaining(p2DiffAddress);
		if (range == null) {
			return new AddressSet();
		}
		return new AddressSet(range);
	}
Reload the marked differences in the diff panel.
Ghidra/Features/ProgramDiff/src/main/java/ghidra/app/plugin/core/diff/ProgramDiffPlugin.java