From https://github.com/chxy/cartogram/blob/master/R/dorling.R Not exported here, but needed for aec_carto_f
complete_color(cl, targetlen)
a vector of colors
the target length
a vector of completed cl with length n
# NOT RUN {
complete_color('red',5)
complete_color(c('red','blue'),5)
complete_color(c('red','blue','green','yellow','pink','grey'),5)
# }
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