Switch from pretty-simple to pretty-show for native output.

Update tests.

Reason:  it turns out that the native output generated by
pretty-simple isn't always readable by the native reader.
According to https://github.com/cdepillabout/pretty-simple/issues/99
it is not a design goal of the library that the rendered values
be readable using 'read'.  This makes it unsuitable for our
purposes.

pretty-show is a bit slower and it uses 4-space indents
(non-configurable), but it doesn't have this serious drawback.

1 files changed, 8 insertions, 14 deletions

diff --git a/test/command/4669.md b/test/command/4669.md
index 20aaaca7e..41f6ae327 100644
--- a/test/command/4669.md
+++ b/test/command/4669.md
@@ -7,9 +7,8 @@
 \end{verbatim}
 ^D
 [ Para
-  [ Span ( "", [], [] ) [ Code ( "", [], [] ) "<-" ] ]
-, CodeBlock
-  ( "", [], [] ) "  while (n > 0) {"
+    [ Span ( "" , [] , [] ) [ Code ( "" , [] , [] ) "<-" ] ]
+, CodeBlock ( "" , [] , [] ) "  while (n > 0) {"
 ]
 ```
 
@@ -24,16 +23,11 @@
 \end{itemize}
 ^D
 [ BulletList
-  [
-    [ Para [ Str "one" ] ]
-  ,
-    [ Para [ Str "two" ] ]
-  ,
-    [ Para [ Str "three" ] ]
-  ,
-    [ Para [ Str "four" ] ]
-  ,
-    [ Para [ Str "five" ] ]
-  ]
+    [ [ Para [ Str "one" ] ]
+    , [ Para [ Str "two" ] ]
+    , [ Para [ Str "three" ] ]
+    , [ Para [ Str "four" ] ]
+    , [ Para [ Str "five" ] ]
+    ]
 ]
 ```