[Rails-devel] Change: Tiles are excluded from upgrade panel if no valid orientation exists

[Frederick W. <fre...@go...>]

Before, selecting a tile of the upgrade panel could lead to the
message "This tile cannot be laid in a valid orientation."

Now, tiles are excluded from the upgrade panel selection if such
message would be issued upon clicking on them. Stated differently,
every tile listed in the upgrade panel can now be laid by the user.

The level of rule enforcement is not affected by this change. So
hopefully there are no objections to this change.