def decreaseToolReach(self):
        """
        Called on scrolling down (default).
        Decreases the reticleOffset (distance between face and brush center) by 1.
        (unless you're in right-click mode and don't have long-distance mode enabled)
        """
        if self.editor.mainViewport.mouseMovesCamera and not self.editor.longDistanceMode:
            return False
        self.reticleOffset = max(self.reticleOffset - 1, 0)
        return True

        Called on scrolling down (default).
        Decreases the reticleOffset (distance between face and brush center) by 1.
        (unless you're in right-click mode and don't have long-distance mode enabled)
        
editortools/brush.py