Units acceleration hovercraft edge case

[marder]

replace UnitMotion with the following in template_unit_siege

<UnitMotion>
  <PassabilityClass>large</PassabilityClass>
  <RunMultiplier>1</RunMultiplier>
  <InstantTurnAngle>10</InstantTurnAngle>
  <Acceleration op="mul">0.05</Acceleration>
  <Weight op="mul">5.0</Weight>
</UnitMotion>

start a game, build a ram and then let it do a 180° turn.

You will notice the it will immediately turn around, but still slowly decelerate in the wrong direction, come to a halt and then slowly re-accelerate in the correct direction.

This seems inconsistent with other turning/ acceleration behavior.

Do note that this is not a bug that you will notice in the unmodified game, as there is no unit with a disabled InstantTurnAngle. It also only happens on a 180 turn.

See this video for another example: ​https://code.wildfiregames.com/file/data/mo5pwjnho2m2trv43ezt/PHID-FILE-ocpmhdmkiy55ujjms7pn/0_A.D._2022-08-15_18-51-31.mp4

[Freagarach]

Pushing back.