Code review comment for lp:~widelands-dev/widelands/bug-1559729-lost_portspace

It is really annoying that in the situation of the screenshot no portspace is shown: https://bugs.launchpad.net/widelands/+bug/1559729/+attachment/4607287/+files/shot0000.png

I have to build another blockhouse to expand the territory. But this blockhouse prevent building a port because there is not enough space. So one has to dismantle the blockhouse again...

Finding a possible port space is luck here. And i don't understand why water has to be discovered because ships do not care about the borders.