Controlling brush diameter increment when using Shift+Scroll

Good. I guess not re-creating the segment editor widget fixed the selection reset issue.

Brush parameters are shared between paint and erase effects, so it is a common parameter, which need to be set by using setCommonParameter method:

effect.setCommonParameter("BrushDiameterIsRelative", "0")
effect.setCommonParameter("BrushAbsoluteDiameter", newDiam)
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