Add a check to prevent user to call AStarGrid2D::update when its not needed

[Chaosus]

I think it's a good small fix to softly prevent user to call it in unappropriated place/time.

[AThousandShips]

I'd just make it an early exit instead of an error

[AThousandShips]

I'd also say this should be noted in the documentation

[Chaosus]

I'd just make it an early exit instead of an error

I disagree - the error will give a user a proper sense of where and when to use this method. Otherwise, the user may spam this method and not even understand that because it returns silently.

[AThousandShips]

But calling it at the "wrong" time with an early exit doesn't come with any cost, and having a check in GDScript for is_dirty will be slower than just calling update and have it just deal with it

[Chaosus]

But calling it at the "wrong" time with an early exit doesn't come with any cost, and having a check in GDScript for is_dirty will be slower than just calling update and have it just deal with it

Hm, I didn't think about the GDScript speed, maybe you've right, changed

[akien-mga]

Thanks!