RStudio knitr markdown, German umlaut causing text to turn green in code chunks

user_10578477 0
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I'm having issues preparing an rmarkdown document in RStudio.
I'm importing a German data set that includes the umlaut "ü". When reading the table into RStudio I have to include the umlaut in a string.

The document is produced without any issues aside from the fact that after the ü, the text becomes the inverse of the color it should be. I created a MWE that reproduces the problem.
In the MWE the first chunk renders as I expect, however in the second chunk, after the word 'lücky' the remaining string elements are black.

Is there a way to avoid this?

MWE output

---
output: pdf_document
---

## MWE
When I use a normal 'u' in lucky everything looks fine
```{r }
a <- c('dog', 'cat', 'rabbit', 'lucky', 'pig', 'sheep', 'goat')
```

When I use a German 'ü' in lucky, the green text is the inverse of as it should be
```{r }
a <- c('dog', 'cat', 'rabbit', 'lücky', 'pig', 'sheep', 'goat')
```

Update with sessionInfo() and options('encoding') : 

> sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
 [1] compiler_3.5.1  backports_1.1.2 magrittr_1.5    rprojroot_1.3-2 htmltools_0.3.6
 [6] tools_3.5.1     yaml_2.2.0      Rcpp_0.12.18    stringi_1.2.4   rmarkdown_1.10 
[11] knitr_1.20      stringr_1.3.1   digest_0.6.16   evaluate_0.11

> options('encoding')
$`encoding`
[1] "native.enc"
rstudio r-markdown knitr r
1 Answers

I used pdflatex as a LaTeX engine to reproduce this strange effect. Additionally i've marked as TRUE the option Keep tex source used to produce PDF. Strange effect eas reproducable and inside the the text source I found the reason:

When I use a normal `u' in lucky everything looks fine

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{a <-}\StringTok{ }\KeywordTok{c}\NormalTok{(}\StringTok{'dog'}\NormalTok{, }\StringTok{'cat'}\NormalTok{, }\StringTok{'rabbit'}\NormalTok{, }\StringTok{'lucky'}\NormalTok{, }\StringTok{'pig'}\NormalTok{, }\StringTok{'sheep'}\NormalTok{, }\StringTok{'goat'}\NormalTok{)}
\end{Highlighting}
\end{Shaded}

When I use a German `ü' in lucky, the green text is the inverse of as it
should be

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{a <-}\StringTok{ }\KeywordTok{c}\NormalTok{(}\StringTok{'düg', '}\NormalTok{cat}\StringTok{', '}\NormalTok{rabbit}\StringTok{', '}\NormalTok{löcky}\StringTok{', '}\NormalTok{pög}\StringTok{', '}\NormalTok{sheep}\StringTok{', '}\NormalTok{goat}\StringTok{')}
\end{Highlighting}
\end{Shaded}

The ü occurs tag changing from expected StringTok into NormalTok to all following strings. That's why the format changed.

So from my point of view it's related to the rendering engine.

user_101277280
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