Glowing brush is not smooth for zig-zag line

[HeraBlockchain]

When drawing a zig-zag line using glowing brush, it was not smooth enough.

If I modify "makeLine" method like this way in "GlowingBrush.swift", it will give a smooth glowing line

    public override func makeLine(from: CGPoint, to: CGPoint, force: CGFloat? = nil, uniqueColor: Bool = false) -> [MLLine] {
        let shadowLines = super.makeLine(from: from, to: to, force: force)
        var coreLines: [MLLine] = []
        let lines = subBrush.makeLine(from: from, to: to, force: force, uniqueColor: true)
        pendingCoreLines.append(contentsOf: lines)
        coreLines.append(contentsOf: pendingCoreLines)
        return shadowLines + coreLines
    }