Combat, troop of Hydras should not move, and attack the targeted troop (and the others) by staying in the same hexes (0.9.6 4111)

[LeHerosInconnu]

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Preliminary checks

• [X] I've checked that there aren't other open issues on the same topic.

Describe the problem requiring a solution

The troop of Hydras should not move and attack the targeted troop (and the others) by staying in the same hexes.

In fheroes2:

https://user-images.githubusercontent.com/43583994/131835286-9fe53b2f-6a45-47a9-9675-8f7d5bc3b7c6.mp4

Flint attacks Roxana.

Here is the save file: AI casts slow no need 01.zip

Describe the possible solution

The troop of Hydras should not move to attack.

Additional info

Related issues: https://github.com/ihhub/fheroes2/issues/3411, https://github.com/ihhub/fheroes2/issues/501. Related closed issue: https://github.com/ihhub/fheroes2/issues/495.

[idshibanov]

Another case of #501 (head and tail hexes).