avm1: Set ConvolutionFilter's alpha to 1 when initialized with a color #18324
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…ha to 1 Initializing ConvolutionFilter with a substitute color will result in the alpha being set to 1 in AVM1, despite the documentation claiming alpha always defaults to 0.
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In AVM1, initializing a ConvolutionFilter with a substitute color will result in the substitute alpha being set to 1.
This doesn't happen in AVM2.
Tested on SWFv8 and SWFv43.