feat: Handle inline references with markup within them

Inline references with markup within them get their contents stashed. We unstash it to find the identifier, that we slugify to allow later resolution.

Follow-up-of-issue-58: #58

Author: pawamoy

Diff for: src/mkdocs_autorefs/references.py

@@ -141,13 +141,25 @@ def handleMatch(self, m: Match[str], data: str) -> tuple[Element | None, int | N
             return None, None, None
 
         if slug is None and re.search(r"[\x00-\x1f]", identifier):
-            # Do nothing if the matched reference contains control characters (from 0 to 31 included).
-            # Specifically `\x01` is used by Python-Markdown HTML stash when there's inline formatting,
-            # but references with Markdown formatting are not possible anyway.
+            # Do nothing if the matched reference still contains control characters (from 0 to 31 included)
+            # that weren't unstashed when trying to compute a slug of the title.
             return None, m.start(0), end
 
         return self._make_tag(identifier, text, slug=slug), m.start(0), end
 
+    def _unstash(self, identifier: str) -> str:
+        stashed_nodes: dict[str, Element | str] = self.md.treeprocessors["inline"].stashed_nodes  # type: ignore[attr-defined]
+
+        def _repl(match: Match) -> str:
+            el = stashed_nodes.get(match[1])
+            if isinstance(el, Element):
+                return f"`{''.join(el.itertext())}`"
+            if el == "\x0296\x03":
+                return "`"
+            return str(el)
+
+        return INLINE_PLACEHOLDER_RE.sub(_repl, identifier)
+
     def _eval_id(self, data: str, index: int, text: str) -> tuple[str | None, str | None, int, bool]:
         """Evaluate the id portion of `[ref][id]`.
 
@@ -188,6 +200,12 @@ def _eval_id(self, data: str, index: int, text: str) -> tuple[str | None, str |
                         identifier = Markup(html).striptags()
                         self.md.htmlStash.rawHtmlBlocks[stash_index] = escape(identifier)
 
+            # In any other case, unstash the title and slugify it.
+            # Examples: ``[`Foo` and `Bar`]``, `[The *Foo*][]`.
+            else:
+                identifier = self._unstash(identifier)
+                slug = slugify(identifier, separator="-")
+
         end = m.end(0)
         return identifier, slug, end, True