Facets: order = 0 doesn't work as expected

[alshan]

The following code is expected to preserve the B,C,A order of original sequence but in reality produces A,B,C sequence of facets:

data = dict(
    cat = ["B", "C", "A"],
    c = ["blue", "cyan", "gray"]
)

p = (ggplot(data) 
     + geom_point(aes(color="c"), size=15) 
     + scale_color_identity() 
     + theme_void() + ggsize(400, 200)
     + facet_wrap("cat", ncol=3, order=0)
    )
p

---

When saving this plot to PNG, the picture is correct!

ggsave(p, "facet_ordering_issue.png")

Saving plot to svg or pdf also produces picture with correct B,C,A order of facets.
However, saving plot to html produces unexpected A,B,C ordering.