AsciiDoc writer: use doubled delims in more contexts.

Also escape the `#` character.

Closes #11362.

An alternative solution, raised in #11362, would be to
rely less on escaping and simply always use doubled delimiters.
However, there would still be a need for escaping, since one
might use a literal `##` (for example)>

src/Text/Pandoc/Writers/AsciiDoc.hs

@@ -163,6 +163,7 @@ escapeString context t
   needsEscape '+' = True
   needsEscape '`' = True
   needsEscape '*' = True
+  needsEscape '#' = True
   needsEscape '_' = True
   needsEscape '<' = True
   needsEscape '>' = True
@@ -593,7 +594,9 @@ inlineListToAsciiDoc opts lst = do
                                    _           -> False
        isSpacy Start (Str xs)
          | Just (c, _) <- T.uncons xs = isPunctuation c || isSpace c
-       isSpacy _ _ = True
+       isSpacy End (Link{}) = True
+       isSpacy End (Image{}) = True
+       isSpacy _ _ = False
 
 setIntraword :: PandocMonad m => Bool -> ADW m ()
 setIntraword b = modify $ \st -> st{ intraword = b }

test/command/11362.md

@@ -0,0 +1,17 @@
+```
+% pandoc -f markdown -t asciidoc
+This is a _test_[^1].
+
+And yet another **one**[^1].
+
+We can also try to write #hashtags [this]{.test}.
+
+[^1]: Test footnote.
+^D
+This is a __test__footnote:[Test footnote.].
+
+And yet another **one**footnote:[Test footnote.].
+
+We can also try to write ++#++hashtags [.test]#this#.
+
+```