private Address getNextAddress() {
		AddressRangeIterator it = p1LastDiffs.getAddressRanges(p1CurrentAddress, true);
		if (!it.hasNext()) {
			return null;
		}
		AddressRange range = it.next();
		if (range.contains(p1CurrentAddress)) {
			if (it.hasNext()) {
				return it.next().getMinAddress();
			}
			return null;
		}
		return range.getMinAddress();

	}
Called from the dialog when the cursor should move to the first difference.
Update the buttons in the dialog according to whether there is
a next or previous.
Ghidra/Features/ProgramDiff/src/main/java/ghidra/app/plugin/core/diff/DiffController.java