Controlling brush diameter increment when using Shift+Scroll

Support
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5

Actually, just found your comment on this post. And have figured out how to handle keyboard press events. An example that decreases brush diameter when “M” is pressed is shown below:

import qt
import slicer

PARAM_DIAM = "BrushAbsoluteDiameter"

def decreaseDiameter():
	segmentEditorWidget = slicer.qMRMLSegmentEditorWidget()
	segmentEditorWidget.setMRMLScene(slicer.mrmlScene)
	segmentEditorNode = slicer.mrmlScene.GetSingletonNode("SegmentEditor", "vtkMRMLSegmentEditorNode")
	slicer.mrmlScene.AddNode(segmentEditorNode)
	segmentEditorWidget.setMRMLSegmentEditorNode(segmentEditorNode)

	segmentEditorWidget.setActiveEffectByName("Paint")
	effect = segmentEditorWidget.activeEffect()

	currentDiam = float(effect.parameter(PARAM_DIAM))
	newDiam = currentDiam - 0.5
	print("decreasing to new diam of %0.2f" % newDiam)
	effect.setParameter(PARAM_DIAM, newDiam)
	effect.forceRender

shortcutDecrease = qt.QShortcut(slicer.util.mainWindow())
shortcutDecrease.setKey(qt.QKeySequence("M"))
shortcutDecrease.connect("activated()", decreaseDiameter)

However, I am having a problem where the brush diameter does not refresh until I move the mouse. Is there a way to force this to repaint?