Units walk over foundations waiting to be constructed

[fabio]

Friendly units should try to avoid walking over foundations. Otherwise they block the building from being built.

Savegame is attached, which is a good test case with a steady stream of trade units.

[quantumstate]

Thanks for reporting this.

This is because there were trade carts walking across the foundation. While units are on top of a foundation the structure cannot be built.

I would guess that the second issue would be the minimum distance required between civ centres. Once I deleted the foundation you had placed I could place a new one.

I have modified the tickets title and description to give a more accurate description. Priority has been lowered because this has an easy workaround of manually stopped the flow of trade units.

[fabio]

See #1450 for a duplicate.

[Deiz]

In 12462:

Have UnitAI respect the LeaveFoundation? order unless in combat. Fixes #1406.

[Deiz]

Solution in r12462 is rather brute-force, but it's very effective. I was considering a pathfinding solution but decided a simple solution would do.

In my testing with 60 traders on a very short (5 metal) route, it took around five builders to get a fortress foundation started (keep in mind that the LeaveFoundation UnitAI function is called by the foundation each time a unit attempts to build, so more builders means more calls).

[k776]

If not done already, can we also give foundations a footprint/obstruction area to prevent new units walking onto foundations once placed?