Making child code chunks execute by clicking "Run current chunk"

knitr

#1

I'm building a modular report what compiles correctly on presing "Knit". I have several report 'modules' linked through child chunks. E.g.

```{r child="load_global_variables.Rmd"}
```

However, clicking "Run current chunk", the little green arrow doesn't work

See also: https://stackoverflow.com/questions/48764918/rmarkdown-running-child-chunks-from-inside-rstudio/48777264?noredirect=1#comment90678331_48777264