Calculate most frequent non-ref allele for multi-variant renderer #4826
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Currently, we use ALT===1 as the color bluish for the multi-variant-renderer, and all else reddish
this worked pretty well, however, some VCF the most frequent ALT would be be e.g. ALT==2
this calculates the most frequent ALT, so that the most frequent gets the blue color. this allows the red vs blue to have more semantic meaning rather than just arbitrary choice of being a non-1 ALT
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after
