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Use absolute size for guide_edge_direction() arrow line #398

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Use absolute size for guide_edge_direction() arrow line #398

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teunbrand
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This PR aims to fix #385.

It set the size of the arrow to the absolute size.

devtools::load_all("~/packages/test/ggraph/")
#> ℹ Loading ggraph
#> Loading required package: ggplot2

gr <- tidygraph::as_tbl_graph(highschool)
ggraph(gr, layout = 'kk') +
  geom_edge_fan(aes(alpha = after_stat(index))) +
  guides(edge_alpha = guide_edge_direction())

Created on 2025-10-08 with reprex v2.1.1

Compared to the current pkgdown image:

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Arrow sizes in guide_edge_direction are broken

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@teunbrand