Produce a vector of suitable vector colors depending on the vertex' state.
| 1 2 3 4 5 | nice_vertex_label_colors(
  graph,
  previous = NULL,
  colors = c("black", "darkgray", wes_palette("Royal1")[2])
)
 | 
| graph | The spgraph object. | 
| previous | The spgraph object of the last iteration. If provided, changed min_dists will be highlighted. | 
| colors | A  | 
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