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, 58 insertions, 61 deletions

diff --git a/test/command/7145.md b/test/command/7145.md
index 21310ccdf..623f40880 100644
--- a/test/command/7145.md
+++ b/test/command/7145.md
@@ -9,67 +9,64 @@ empty
 linebreaks</ref>  Nulla ut massa eget ex venenatis lobortis id in eros.
 ^D
 [ Para
-  [ Str "Maecenas"
-  , Space
-  , Str "at"
-  , Space
-  , Str "sapien"
-  , Space
-  , Str "tempor,"
-  , Space
-  , Str "pretium"
-  , Space
-  , Str "turpis"
-  , Space
-  , Str "ut,"
-  , Space
-  , Str "imperdiet"
-  , Space
-  , Str "augue."
-  , Note
-    [ Para
-      [ Str "This"
-      , Space
-      , Str "is"
-      , Space
-      , Str "a"
-      , Space
-      , Str "multiline"
-      ]
-    , Para
-      [ Str "reference"
-      , SoftBreak
-      , RawInline
-        ( Format "html" ) "<i>"
-      , Str "with"
-      , RawInline
-        ( Format "html" ) "</i>"
-      , SoftBreak
-      , Str "empty"
-      ]
-    , Para
-      [ Str "linebreaks" ]
+    [ Str "Maecenas"
+    , Space
+    , Str "at"
+    , Space
+    , Str "sapien"
+    , Space
+    , Str "tempor,"
+    , Space
+    , Str "pretium"
+    , Space
+    , Str "turpis"
+    , Space
+    , Str "ut,"
+    , Space
+    , Str "imperdiet"
+    , Space
+    , Str "augue."
+    , Note
+        [ Para
+            [ Str "This"
+            , Space
+            , Str "is"
+            , Space
+            , Str "a"
+            , Space
+            , Str "multiline"
+            ]
+        , Para
+            [ Str "reference"
+            , SoftBreak
+            , RawInline (Format "html") "<i>"
+            , Str "with"
+            , RawInline (Format "html") "</i>"
+            , SoftBreak
+            , Str "empty"
+            ]
+        , Para [ Str "linebreaks" ]
+        ]
+    , Space
+    , Str "Nulla"
+    , Space
+    , Str "ut"
+    , Space
+    , Str "massa"
+    , Space
+    , Str "eget"
+    , Space
+    , Str "ex"
+    , Space
+    , Str "venenatis"
+    , Space
+    , Str "lobortis"
+    , Space
+    , Str "id"
+    , Space
+    , Str "in"
+    , Space
+    , Str "eros."
     ]
-  , Space
-  , Str "Nulla"
-  , Space
-  , Str "ut"
-  , Space
-  , Str "massa"
-  , Space
-  , Str "eget"
-  , Space
-  , Str "ex"
-  , Space
-  , Str "venenatis"
-  , Space
-  , Str "lobortis"
-  , Space
-  , Str "id"
-  , Space
-  , Str "in"
-  , Space
-  , Str "eros."
-  ]
 ]
 ```