void setNewEndAddress(Address newEnd) {
		message = "";
		newEndAddr = newEnd;
		newStartAddr = getStartAddress(newEnd);
		if (newStartAddr == null) {
			message = "End Address is too small";
		}
		listener.stateChanged();
	}
Set the new end address for the block.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/memory/MoveBlockModel.java