Using `annotate()` rather than `geom_segment` in critical difference plots to avoid warning

[jemus42]

Reprex:

library(mlr3benchmark)
library(ggplot2)

# Create a simple benchmark aggregation dataset
set.seed(123)

xdat = expand.grid(
  task_id = factor(paste0("Task", 1:10)),
  learner_id = factor(paste0("Learner", 1:3))
)

xdat$RMSE[xdat$learner_id == "Learner1"] <- runif(10, 1, 2)
xdat$RMSE[xdat$learner_id == "Learner2"] <- runif(10, 5, 6)
xdat$RMSE[xdat$learner_id == "Learner3"] <- runif(10, 8, 10)

# Create BenchmarkAggr object
ba <- BenchmarkAggr$new(xdat)

autoplot(
  ba,
  type = "cd",
  test = "bd",
  meas = "RMSE",
  style = 1
)
#> Warning in geom_segment(aes(x = 0, xend = max(rank) + 1, y = 0, yend = 0)): All aesthetics have length 1, but the data has 3 rows.
#> ℹ Please consider using `annotate()` or provide this layer with data containing
#>   a single row.

packageVersion("ggplot2")
#> [1] '3.5.2'
packageVersion("mlr3benchmark")
#> [1] '0.1.7.9000'

^{Created on 2025-08-04 with reprex v2.1.1}

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value
#>  version  R version 4.4.3 (2025-02-28)
#>  os       macOS Sequoia 15.5
#>  system   aarch64, darwin20
#>  ui       X11
#>  language (EN)
#>  collate  en_US.UTF-8
#>  ctype    en_US.UTF-8
#>  tz       Europe/Berlin
#>  date     2025-08-04
#>  pandoc   3.7.0.2 @ /usr/local/bin/ (via rmarkdown)
#>  quarto   1.7.32 @ /Applications/quarto/bin/quarto
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
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#> 
#>  [1] /Users/Lukas/Library/R/arm64/4.4/library
#>  [2] /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library
#>  * ── Packages attached to the search path.
#> 
#> ──────────────────────────────────────────────────────────────────────────────

Fix is probably trivial, will make a PR later