AHUD::GetTextSize() does return width and height of 0

[anonymous_user_f3fb80e6]

Sure, my use case is quite straight-forward. I have created a library class in C++, like this:

UCLASS()
class GLOW_API UMyStaticToolkit : public UObject
{
    GENERATED_BODY()

public:
    static void SetActorDebugText(UWorld* World, AActor* Actor, FString String, FColor Color = FColor::White);
};

The implementation of this class looks like this:

void UMyStaticToolkit::SetActorDebugText(UWorld* World, AActor* Actor, FString String, FColor Color)
{
    AHUD* HUD = World->GetFirstPlayerController()->GetHUD();
    float width = 0.0f, height = 0.0f;
    if(GEngine != nullptr)
    {
        HUD->GetTextSize(String, width, height, GEngine->GetMediumFont());
        PrintString(FString::SanitizeFloat(width));  // this prints out "0"
    }

    HUD->RemoveDebugText(Actor);
    HUD->AddDebugText(String, Actor, -1.0f, FVector(0.0f, 0.0f, 100.0f), FVector(0.0f, 0.0f, 100.0f), Color, true, false, true);
}

Now I simply call this static method UMyStaticToolkit::SetActorDebugText() from other places in my C++ code in order to print some debug text above the head of my actor(s). This works, text is being rendered. However, the width returned by GetTextSize() is always 0 …