Fix setting edge colors for Chord graphs using an explicit mapping #3734
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and normalization (which is turned on by default).
Details:
The color map's vmin/vmax was computed based on factors of the whole range
whereas the palette only used the factors from the actually used values.
When using color normalization this lead to:
-- LineCollection normalizing via vmin/vmax computed above, reflecting the
whole range.
-- ListedColormap is transforming the normalized color values provided by the
LineCollection using its own size (N). However that size N was based on the
actually used values and hence too small.