In general, the units specified in the MAI setup should be on the AI side. However, that might change during a scenario, for example when there is an event that switches units to other sides.
The final determination of the hex to move to must take enemies into account, otherwise the MAI might try to move the unit to a hex it cannot actually reach.
Numerical values are sometimes transferred from WML to Lua using the string type. This applies, for example, to very small numbers, such as 0.0000000000001. This needs to be taken into account when checking whether avoid_enemies is a number.
If a unit is passed as the last argument to this function, the returned hex is supposed to be passable for that unit. Hexes on the map border need to be excluded in this case.
This specifically also fixes a bug in the Messenger Escort Micro AI. Previously, waypoints right at the map border could sometimes lead to the AI showing an on-screen error message and becoming inactive.
Previously, a rabbit hole item on the map border could be selected for spawning a new rabbit, resulting in an error message on screen and abandoning the CA for the rest of the turn.
The algorithm used in this CA is too simple to work reliably in a general setting, it tends to send whole groups of units toward small numbers of villages, or even individual ones. In its current version, it should not be used at all, not even in the Experimental AI. The recommended way to emphasize village hunting is to set the village_value aspect to a larger-than-default value and let the move-to-targets CA take care of it.
An updated version of this CA's code is, however, left in place for potential future work as an external CA in Wesnoth 1.15.
This scenario uses the huge final map from THoT, with different situations
split across different rooms of the map. THoT's final scenario was redesigned
with a completely new map in 457d9d17f, so this gives the test code its own
copy of the map.
There's a one-hex change to the original: the test puts side 1's leader in a
wall, isolated from the action. To clarify that that's intentional, the map
copy changes that hex to be passable, still surrounded by wall.
This parameter determines in which order the available AIs are shown in the MP computer player selection menu. This can be used for eras, modifications or cores to change which AI is first in the list.
Another efficiency improvement. This ensures that the side of the unit
is checked first before the potentially complex rest of the filter is
evaluated.
The old method is very slightly faster in some circumstances (e.g. for
simple filters and when all units have moves/attacks/etc. left), but we
are talking fractions of micro seconds. By contrast, depending on the
filter used, the new method can save large amounts of evaluation time
once some units have move or attacked.
