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Document a bug in Actor_ChangeCategory where actors may not be updated correctly (#1587)

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* Document Actor_ChangeCategory bug

* Reword

* actor update function -> actor update
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cadmic 2023-11-30 17:18:00 -08:00 committed by GitHub
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src/code/z_actor.c
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@ -3397,6 +3397,12 @@ Actor* func_80033684(PlayState* play, Actor* explosiveActor) {
* This is done by moving it to the corresponding category list and setting its category variable accordingly. * This is done by moving it to the corresponding category list and setting its category variable accordingly.
*/ */
void Actor_ChangeCategory(PlayState* play, ActorContext* actorCtx, Actor* actor, u8 actorCategory) { void Actor_ChangeCategory(PlayState* play, ActorContext* actorCtx, Actor* actor, u8 actorCategory) {
//! @bug Calling this function immediately moves an actor from one category list to the other.
//! So, if Actor_ChangeCategory is called during an actor update, the inner loop in
//! Actor_UpdateAll will continue from the next actor in the new category, rather than the next
//! actor in the old category. This will cause any actors after this one in the old category to
//! be skipped over and not updated, and any actors in the new category to be updated more than
//! once.
Actor_RemoveFromCategory(play, actorCtx, actor); Actor_RemoveFromCategory(play, actorCtx, actor);
Actor_AddToCategory(actorCtx, actor, actorCategory); Actor_AddToCategory(actorCtx, actor, actorCategory);
} }