Brightness Curve Transformation Amount Slider Problem

[jfoster]

The amount slider seems to work inconsistently in the Brightness Curve Transformation (no mask used).
To reproduce (rev 273):

1. Create Checkboard Test Pattern
2. Open Brightness Curve Transformation
3. Move amount slider to 0%
4. Modify the brightness curve
5. Move amount slider to 100%. Note that the preview does not reflect the brightness change

Jeff

[jsachs]

Fixed for next release -- it looks like I commented out some code while debugging and forgot to uncomment it.