Preview not working with some Adjust filters

[silvio grosso]

Hi everyone,

I have just dicovered a small problem with some filters related to their preview.

This bug is somewhat "similar" to this other one: 
https://bugs.kde.org/show_bug.cgi?id=233950

It looks like it is not reported yet on the Bug list web-page:
https://bugs.kde.org/buglist.cgi?quicksearch=krita

In short, with these filters their preview don't work: 
- Adjust > Levels;
- Adjust > Color Adjustments curves;
- Adjust > Brigthness, Contrast curves.

Steps to reproduce the problem (Krita 2.4 b3 - Ubuntu 11.10):
- Open an image (e.g. a png);
- Filter > Adjust > Levels > change something in the values;
- Nothing occurs in the canvas even though the preview box is ticked;
- You are forced to hit Ok to apply your change to the image.

Should I fill a new ticket or it is already a known bug?

Silvio Grosso
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