Some merchant ships can't reach their market

[mimo]

Some merchant ships seem are too big to be able to go within distance of their target market. This is reproducible in the trading demo map, trying to trade with the roman ship. It stays blocked at the dock, while everything is fine with the other (smaller) ship. Increasing the Trader.MaxDistance from 10 to 12 (the size of its footprint) in template_unit_mechanical_ship_merchant.xml solves the problem.

[mimo]

This problem is in fact connected to the obstruction (8 for this ship while all other merchant ships have 6). But still the bug is here and easily reproducible in the trading demo map. Increasing the trader.MaxDistance (from the default 10 to 12) in rome_ship_merchant.xml will fix it.

[leper]

In 13362:

Fix roman merchant ship trading distance. Fixes #1874.

[leper]

Thanks for reporting and bumping it.