```{python} applied to R cells in Rmd

[tomcatlingcma]

Issue

Jupytext applies ```{python} in .Rmd to cells in a notebook created with an R kernel.

Steps to reproduce

Using jupytext 1.1.1 and c.ContentsManager.default_jupytext_formats = "ipynb,Rmd" in notebook config.

• Create a new notebook with an R kernel.
• Save it from the .ipynb file.
• Open the .Rmd file in the editor - it looks like below.

---
jupyter:
  jupytext:
    text_representation:
      extension: .Rmd
      format_name: rmarkdown
      format_version: '1.1'
      jupytext_version: 1.1.1
  kernelspec:
    display_name: R
    language: R
    name: ir
---

```{python}
a<-1
```  

```{python}

```

• Close above and re-open the .ipynb file, it renders as below and does not run because a<-1 is not valid python.

• Manually changing ```{python} to ```{r} in the .Rmd seems to result in a stable state where things work as expected, even for new cells created later in the notebook.

---
jupyter:
  jupytext:
    text_representation:
      extension: .Rmd
      format_name: rmarkdown
      format_version: '1.1'
      jupytext_version: 1.1.1
  kernelspec:
    display_name: R
    language: R
    name: ir
---

```{r}
a<-1
```

```{r}

```

[mwouts]

Hello @tomcatlingcma , thanks for the report ! Let me see if I can reproduce (and fix) this...

[mwouts]

I confirm the issue, and I should be able to fix it soon.

Meanwhile, when you create a new notebook, please delete the main_language metadata that has been inserted in the notebook metadata (I think that the language is wrong because it was computed on a fully empty notebook, with no kernel information and no cell...)

{
  "jupytext": {
    "main_language": "python"
  },
  "kernelspec": {
    "name": "ir",
    "display_name": "R",
    "language": "R"
  },
  "language_info": {
    "name": "R",
    "codemirror_mode": "r",
    "pygments_lexer": "r",
    "mimetype": "text/x-r-source",
    "file_extension": ".r",
    "version": "3.4.3"
  }
}

[tomcatlingcma]

Thanks for your very fast response!

Happy to do as you propose above in the meantime. This is a great project which solves a common issue with .ipynb in an elegant way.

[mwouts]

Hello @tomcatlingcma , can you give a try to version 1.1.2? The problem should be fixed now, at least for new notebooks. Thanks!

[tomcatlingcma]

Confirmed fixed - thanks!!