The main problem was that the previous calculation was based on the 'caution' aspect. While that is not technically wrong, caution is also used for other purposes and there are mainline (and presumably UMC) scenarios that use large values for caution. In those cases, units retreated that were barely injured. This, again, might even be desirable for some use cases, but it needs to be decoupled from the other uses of caution. Thus, the new 'retreat_factor' aspect is used now.
In addition, the calculation is now based on a unit's maximum hitpoints, rather than its level.
The ai_helper functions are optimized for speed (as much as possible in a general setting) and do all the necessary tests. For example, get_units_with_attacks() checks both whether the unit has attacks left, and whether it has any attacks in the first place.
(cherry-picked from commit 75843541bcf92e743b911ef49046c54a050e8a0f)
The relative ranking of the CA scores is not changed, except for one case when two CAs had the same score.
Reasons:
- All scores should be lower than the scores of the default Goto CA (200,000) and the default scores of most Micro AIs (300,000).
- Break tie, resulting in uncertain order of execution, of place_healers and retreat_injured CA. Healers should be placed first, to allow retreating injured units to adjacent hexes.
- Set default for generic_recruit_engine to slightly above default AI recruiting score. That way it takes effect even if the default CA is not removed.
- Increase move_to_any_enemy CA score from 1 to 1,000. It is still the lowest score that way, but allows for setting up custom CAs with even lower scores (even if it is just for end-of-turn statistics or the like).
(cherry-picked from commit 35ba82050954c2cee86321e05d6706993c08e143)
Now that all the AIs use external CAs, there is no need to use the persistent 'data' variable any more, unless information is to be exchanged between different CAs or is supposed to be persistent across save/load cycles.
(cherry-picked from commit 3bfd59f28ba7f70a6ac32782e98cba9ca6c2a44a)
