backticks on non-ascii labels

[gagnagaman]

Upgrading to version 3.10 of ggplot2 I encountered a strange behaviour
with regards to non-ascii (utf-8) characters in labels.
In some cases ggplot will wrap the labels with backticks. In other cases
(with the same character) it will not. I have been examining this and it
seems that the strange behaviour only occurs when the non-ascii character
isn't the first one in the string. Thus in the example below when mán is the variable on
the x axis it gets wrapped but ár does not.

# pseudo data with the same non-ascii letter in two different locations.
> df=data.frame(ár=rep(1991:2000,each=12),mán=rep(1:12,10))
> df$hiti=with(df,ár/2000 + 10* sin(mán/12*2*pi) + rnorm(120))
> library(ggplot2)
> ggplot(data=df,aes(mán,hiti)) + geom_point()
> ggplot(data=df,aes(ár,hiti)) + geom_point()

[yutannihilation]

Thanks for reporting, this is already fixed in the dev version by #2981. You can try the dev version by devtools::install_github("tidyverse/ggplot2"), or set labels manually (e.g. xlab()).

ggplot(data=df,aes(mán,hiti)) + geom_point() + xlab("mán")

(By the way, it's curious why expr_text() adds backticks to mán, which seems to ok to use without backticks...)

library(rlang)

expr_text(sym("mán"))
#> [1] "`mán`"
expr_text(sym("ár"))
#> [1] "ár"

mán <- 1
mán
#> [1] 1

^{Created on 2018-11-27 by the reprex package (v0.2.1)}

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