[Rails-devel] New tiles to be connected

[Erik V. <eri...@hc...>]

I have added a check on laying yellow tiles,
that ensures that such tiles are somehow connected to existing track.
The obvious exceptions are:
- a city tile on the operating company's home base,
- unconnected tile lays enabled by private special abilities.

We can't yet check connection to a home base, 
but this new check already reduces the amount of invalid tile lays.

> 3. Initially I had created a new Move subclass to move the 
> ability object, 
> but it occurred to me that undoable object moves are in fact 
> pretty generic.
> The new class ObjectMove now handles both token and ability 
> object moves.
> Perhaps other objects moves can be merged into this class as well.
> Two new interfaces Moveable and MoveableHolderI support this 
> now generic mechanism.

Train and Certificate transfers are now also handled by ObjectMove.
This is all we can do here, I think.

Erik.