Loops make edge label colours inconsistent

[mabafaba]

Loop edges are not counted when an array of colours is assigned to label colours. The colour of a loop and all following edge labels have the wrong color. other attributes seem ok.

g<-matrix(c(
            1,2 #first edge
           ,1,1 #second edge
           ,2,3) #third edge
          ,nrow=3,ncol=2,byrow = T)

g<-graph_from_edgelist(g, directed = F)
cols<-c('red','green','blue')

plot(g
     ,edge.color = cols
     ,edge.label.color = cols
     ,edge.label= cols
     )

[gaborcsardi]

Yep, seems like a bug.

[ntamas]

Note to self when we finally find time to fix this: the problem seems to be that plot.igraph() plots loop and non-loop edges separately, but it only separates the "label" property into two vectors (for loops and non-loops), not the label colors or any other label-related visual properties.

[ntamas]

Reprex:

library(igraph)
#> 
#> Attaching package: 'igraph'
#> The following objects are masked from 'package:stats':
#> 
#>     decompose, spectrum
#> The following object is masked from 'package:base':
#> 
#>     union
g <- make_graph(c(1, 2, 1, 1, 2, 3), directed = F)
cols <- c('red','green','blue')
plot(g, edge.color = cols, edge.label.color = cols, edge.label = cols)

^{Created on 2022-12-14 with reprex v2.0.2}

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