Fix ftintitle plugin to prioritize explicit featuring tokens

- Prioritize explicit featuring tokens (feat, ft, featuring) over generic
  separators (&, and) when splitting artist names
- Prevents incorrect splits like 'Alice & Bob feat Charlie' from splitting
  on '&' instead of 'feat'
- Add test cases to verify the fix

beetsplug/ftintitle.py

@@ -36,11 +36,23 @@ def split_on_feat(
     artist, which is always a string, and the featuring artist, which
     may be a string or None if none is present.
     """
-    # split on the first "feat".
-    regex = re.compile(
-        plugins.feat_tokens(for_artist, custom_words), re.IGNORECASE
+    # Try explicit featuring tokens first (ft, feat, featuring, etc.)
+    # to avoid splitting on generic separators like "&" when both are present
+    regex_explicit = re.compile(
+        plugins.feat_tokens(for_artist=False, custom_words=custom_words),
+        re.IGNORECASE,
     )
-    parts = tuple(s.strip() for s in regex.split(artist, 1))
+    parts = tuple(s.strip() for s in regex_explicit.split(artist, 1))
+    if len(parts) == 2:
+        return parts
+
+    # Fall back to all tokens including generic separators if no explicit match
+    if for_artist:
+        regex = re.compile(
+            plugins.feat_tokens(for_artist, custom_words), re.IGNORECASE
+        )
+        parts = tuple(s.strip() for s in regex.split(artist, 1))
+
     if len(parts) == 1:
         return parts[0], None
     else:

docs/changelog.rst

@@ -62,6 +62,9 @@ Bug fixes:
   "albumartist" instead of a list of unique album artists.
 - Sanitize log messages by removing control characters preventing terminal
   rendering issues.
+- :doc:`/plugins/ftintitle`: Fixed artist name splitting to prioritize explicit
+  featuring tokens (feat, ft, featuring) over generic separators (&, and),
+  preventing incorrect splits when both are present.
 
 For plugin developers:
 

test/plugins/test_ftintitle.py

@@ -303,6 +303,10 @@ def test_find_feat_part(
         ("Alice and Bob", ("Alice", "Bob")),
         ("Alice With Bob", ("Alice", "Bob")),
         ("Alice defeat Bob", ("Alice defeat Bob", None)),
+        ("Alice & Bob feat Charlie", ("Alice & Bob", "Charlie")),
+        ("Alice & Bob ft. Charlie", ("Alice & Bob", "Charlie")),
+        ("Alice & Bob featuring Charlie", ("Alice & Bob", "Charlie")),
+        ("Alice and Bob feat Charlie", ("Alice and Bob", "Charlie")),
     ],
 )
 def test_split_on_feat(