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, 21 insertions, 21 deletions

diff --git a/test/command/5686.md b/test/command/5686.md
index 445b732ed..d669ae49b 100644
--- a/test/command/5686.md
+++ b/test/command/5686.md
@@ -5,27 +5,27 @@ FOO\t0BAR
 This part does not make it to the html output.
 ^D
 [ Para
-  [ Str "FOO", RawInline ( Format "tex" ) "\\t0", Str "BAR" ]
+    [ Str "FOO" , RawInline (Format "tex") "\\t0" , Str "BAR" ]
 , Para
-  [ Str "This"
-  , Space
-  , Str "part"
-  , Space
-  , Str "does"
-  , Space
-  , Str "not"
-  , Space
-  , Str "make"
-  , Space
-  , Str "it"
-  , Space
-  , Str "to"
-  , Space
-  , Str "the"
-  , Space
-  , Str "html"
-  , Space
-  , Str "output."
-  ]
+    [ Str "This"
+    , Space
+    , Str "part"
+    , Space
+    , Str "does"
+    , Space
+    , Str "not"
+    , Space
+    , Str "make"
+    , Space
+    , Str "it"
+    , Space
+    , Str "to"
+    , Space
+    , Str "the"
+    , Space
+    , Str "html"
+    , Space
+    , Str "output."
+    ]
 ]
 ```