fix: implement automatic zorder assignment for proper trace layering

DESCRIPTION

@@ -23,7 +23,7 @@ Description: Create interactive web graphics from 'ggplot2' graphs and/or a cust
 URL: https://plotly-r.com, https://github.com/plotly/plotly.R, https://plotly.com/r/
 BugReports: https://github.com/plotly/plotly.R/issues
 Depends:
-    R (>= 3.2.0),
+    R (>= 3.5),
     ggplot2 (>= 3.0.0)
 Imports:
     tools,

R/ggplotly.R

@@ -1153,6 +1153,14 @@ gg2list <- function(p, width = NULL, height = NULL,
   l$cur_data <- ids[[layerData]]
   l$visdat <- setNames(lapply(return_dat, function(x) function(y) x), ids)
 
+  # automatically assign zorder values based on trace positionAdd commentMore actions
+  # this ensures proper layering (later traces on top) for ggplot2 without manual intervention
+  for (i in seq_along(l$data)) {
+    if (is.null(l$data[[i]]$zorder)) {
+      l$data[[i]]$zorder <- i
+    }
+  }
+
   l
 }
 

inst/htmlwidgets/lib/plotlyjs/LICENSE

@@ -1,6 +1,6 @@
-The MIT License (MIT)
+MIT License
 
-Copyright (c) 2021 Plotly, Inc
+Copyright (c) 2016-2024 Plotly Technologies Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal