Set all transparent colors to be equal in quantize() #5282
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When
quantize()converts an RGBA image to P mode, it currently translates two pixels with full transparency as different if they have different RGB values. This PR sets all transparent pixels to have the same RGB values as the first transparent pixel, so that they all end up with the same P value.This improvement is also helpful when it comes to GIFs, which can only mark one color in the palette as transparent. This resolves the second part of #3603