Read the inline nodes and the marks back, and keep the whitespace CommonMark does not strip

corpus/errors/directive-content-slot.md

@@ -1 +1 @@
-Part :mention[@Mikael]{id=b1c2}.
+Part :mention[**@Mikael**]{id=b1c2}.

corpus/errors/directive-mark-markdown.error

@@ -0,0 +1 @@
+unsupported-node-shape

corpus/errors/directive-mark-markdown.md

@@ -0,0 +1 @@
+Part :em[emphasised] here.

corpus/errors/directive-text-plain.error

@@ -0,0 +1 @@
+unsupported-node-shape

corpus/errors/directive-text-plain.md

@@ -0,0 +1 @@
+Part :text{text=plain} here.

corpus/round-trip/inline-nodes/text-whitespace.json

@@ -80,6 +80,15 @@
         }
       ],
       "type": "paragraph"
+    },
+    {
+      "content": [
+        {
+          "text": "\u000bEdged with the whitespace CommonMark keeps\f",
+          "type": "text"
+        }
+      ],
+      "type": "paragraph"
     }
   ],
   "type": "doc",

corpus/round-trip/inline-nodes/text-whitespace.md

@@ -11,3 +11,5 @@ Space after the break\
 :text{text=" "}survives too.
 
 Kept _:text{text=" "}inside:text{text=" "}_, exactly.
+
+Edged with the whitespace CommonMark keeps