Markdown reader: don't parse links or bracketed spans as citations.

Previously pandoc would parse

    [link to (@a)](url)

as a citation; similarly

    [(@a)]{#ident}

This is undesirable.  One should be able to use example references
in citations, and even if `@a` is not defined as an example
reference, `[@a](url)` should be a link containing an author-in-text
citation rather than a normal citation followed by literal `(url)`.

Closes #7632.

1 files changed, 66 insertions, 0 deletions

diff --git a/test/command/7632.md b/test/command/7632.md
new file mode 100644
index 000000000..4256bc207
--- /dev/null
+++ b/test/command/7632.md
@@ -0,0 +1,66 @@
+```
+% pandoc -t native
+(@a) First case
+
+[link to (@a)](url)
+^D
+[ OrderedList
+    ( 1 , Example , TwoParens )
+    [ [ Plain [ Str "First" , Space , Str "case" ] ] ]
+, Para
+    [ Link
+        ( "" , [] , [] )
+        [ Str "link" , Space , Str "to" , Space , Str "(1)" ]
+        ( "url" , "" )
+    ]
+]
+```
+
+```
+% pandoc -t native
+[@a]{.class}
+^D
+[ Para
+    [ Span
+        ( "" , [ "class" ] , [] )
+        [ Cite
+            [ Citation
+                { citationId = "a"
+                , citationPrefix = []
+                , citationSuffix = []
+                , citationMode = AuthorInText
+                , citationNoteNum = 1
+                , citationHash = 0
+                }
+            ]
+            [ Str "@a" ]
+        ]
+    ]
+]
+
+```
+
+```
+% pandoc -t native
+[@a](url)
+^D
+[ Para
+    [ Link
+        ( "" , [] , [] )
+        [ Cite
+            [ Citation
+                { citationId = "a"
+                , citationPrefix = []
+                , citationSuffix = []
+                , citationMode = AuthorInText
+                , citationNoteNum = 1
+                , citationHash = 0
+                }
+            ]
+            [ Str "@a" ]
+        ]
+        ( "url" , "" )
+    ]
+]
+
+```