Bar chart x-axis factor order wrong

[13bzhang]

When I was writing tests for #241, I came across this problem where the bar chart x-axis factor level order is wrong.

R code:

set.seed(23049)
long_items <- data.frame(cat1 = sample(x = LETTERS[1:10], 
                                  size = 100, replace = TRUE),
                    cat2 = sample(x = LETTERS[1:10],
                                  size = 100, replace = TRUE))
p <- ggplot(long_items, aes(cat1, fill=cat2)) + geom_bar(position="dodge")
py$ggplotly(p)

ggplot2 figure:

Note the figure above has the x-axis in alphabetical order.

Plotly figure (based on PR #241): https://plot.ly/~13bzhang/1365/count-vs-cat1/

Now the x-axis is not in alphabetical order.

@cpsievert @chriddyp @mkcor

[cpsievert]

The x-axis ordering is controlled by the order in which values first appear in the trace data:

l <- plotly_build(p)
# notice how this matches the x-axis ordering
unique(unlist(lapply(l$data, "[[", "x")))
#>  [1] A B C E F I G H J D
#> Levels: A B C D E F G H I J

It seems like I should be able to control this ordering by setting the range of the axis, but this doesn't do what I want, any ideas @chriddyp @cldougl?

l$layout$xaxis$range <- LETTERS[1:10]
l

[cpsievert]

This should be fixed in f1900cc. Let us know if you still have problems.