Use [x] not [X] for asciidoctor checklists.

See #7798.

src/Text/Pandoc/Writers/AsciiDoc.hs

@@ -353,12 +353,12 @@ bulletListItemToAsciiDoc opts blocks = do
     contents <> cr
 
 -- | Convert a list item containing text starting with @U+2610 BALLOT BOX@
--- or @U+2612 BALLOT BOX WITH X@ to org checkbox syntax (e.g. @[X]@).
+-- or @U+2612 BALLOT BOX WITH X@ to asciidoctor checkbox syntax (e.g. @[x]@).
 taskListItemToAsciiDoc :: [Block] -> [Block]
 taskListItemToAsciiDoc = handleTaskListItem toOrg listExt
   where
     toOrg (Str "☐" : Space : is) = Str "[ ]" : Space : is
-    toOrg (Str "☒" : Space : is) = Str "[X]" : Space : is
+    toOrg (Str "☒" : Space : is) = Str "[x]" : Space : is
     toOrg is = is
     listExt = extensionsFromList [Ext_task_lists]
 

test/Tests/Writers/AsciiDoc.hs

@@ -89,7 +89,7 @@ tests = [ testGroup "emphasis"
           [ testAsciidoctor "bullet task list" $
                bulletList [plain "☐ a", plain "☒ b"] =?> unlines
                                            [ "* [ ] a"
-                                           , "* [X] b"
+                                           , "* [x] b"
                                            ]
           ]
         ]