Progressively render the exercise Rmd to accurately capture prep and …

…result environments (#480)

Co-authored-by: Barret Schloerke <[email protected]>

DESCRIPTION

@@ -1,7 +1,7 @@
 Type: Package
 Package: learnr
 Title: Interactive Tutorials for R
-Version: 0.10.1.9007
+Version: 0.10.1.9008
 Authors@R: 
     c(person(given = "Barret",
              family = "Schloerke",

NEWS.md

@@ -48,6 +48,7 @@ learnr (development version)
 * When `exercise.completion=TRUE`, completion is no longer performed inside of quotes. This (intentionally) prevents the student from being able to list files on the R server ([#401](https://github.com/rstudio/learnr/issues/401)).
 * Fail gracefully when unable to open an indexedDB store (e.g. in cross-origin iframes in Safari). ([#417](https://github.com/rstudio/learnr/issues/417)).
 * When a quiz's question or answer text are not characters, e.g. HTML, `htmltools` tags, numeric, etc., they are now cast to characters for the displayed answer text and the quiz's default loading text ([#450](https://github.com/rstudio/learnr/pull/450)).
+* The `envir_prep` environment used in exercise checking now captures the result of both global and exercise-specific setup code, representing the environment in which the user code will be evaluated as described in the documentation. We also ensure that `envir_result` (the environment containing the result of evaluating global, setup and user code) is a sibling of `envir_prep`. ([#480](https://github.com/rstudio/learnr/pull/480))
 
 learnr 0.10.1
 ===========