Comment 3 for bug 1190207

I tested this problem and I have notice two things:
a) From screencast I see that on Mac (I don't have a Mac, so can't confirm this on my case) when using Polar Inversion and changing slides it doesn't happen anything, but using other effects are applied immediately. I tried this on Windows XP master and changes does take effect every time I change slider.

b) I have looked at the image from #2 and tested on Pinta master on Windows XP and compared with Paint.net 3.5 on Windows XP and for Edge Behavior "Wrap" and I see it does not produce the same result, don't know if this is a bug or intentional. I am not an expert on using effects, maybe someone else should look at this problem.