ConvertAlphaToMask, work in 4.1.0, but fail in 4.1.1

    self.bmp = wx.Bitmap("shape.png")

    img = self.bmp.ConvertToImage()
    self.bmp = img.ConvertToBitmap()

Same code, showed good transparent image in 4.1.0, but showed as an opaque rectangle in 4.1.1.
Not sure if it is a bug or else.

Yes, it is a known bug. A fix has been implemented and it should work again in the recent snapshot builds.

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