PostEditChangeProperty called an arbitrary number of times

Development Programming & Scripting
1

As the title suggests, a property change can trigger multiple calls of PostEditChangeProperty. The function might run once or 3+ times. When creating a Blueprint subclass it also happened that with every Blueprint compile the number of calls incremented. I stopped at ~10 for 1 property change.

Steps to reproduce: New C++ project. New C++ Actor (or anyhting that has PostEditChangeProperty I guess). Override PostEditChangeProperty and just do a UE_LOG. If it behaves fine just try another class or project (I first noticed it when adjusting the character in the C++ FPS template).
edit: Forgot to mention to create a BP subclass and change the propperty in the editor. I assume this function is only called when making changes to the property in the editor as it is often enclosed in a WITH_EDITOR macro. Not sure on this one though.

I am not too confident when it comes to UE4 programming, therefore I am cautious when calling something a bug, but this issue seems so basic that I just don’t see what could be wrong on my end. I am still on 4.17.1 but the changelog of 4.17.2 didn’t mention anything relevant.

2

Still happening in 4.22

3

still 4.25

4

Still happening in 4.25

5

Same problem on UE5.0.3 How are we supposed to do to react only once on a BP setting change ?

6

Yep, same problem on 5.0.3, very annoying.

7

Have the same problem on 4.27.

I suppose that PostEditChangeProperty called for every actor placede in your level too(just like Construction script). So check number of calls in empty level.

Parent/child relationship might be another source for this behaviour, but I never check this.

8

Hmm weird. We use PostEditChangeProperty() extensively since probably Unreal 4.15 and have never seen this issue… :expressionless: