[utils] Sanitize look-alike Unicode glyphs in non-ID filename fields …

…when --restrict-filenames

Implements ytdl-org#31216 (comment), which has a test.

youtube_dl/utils.py

@@ -33,6 +33,7 @@
 import tempfile
 import time
 import traceback
+import unicodedata
 import xml.etree.ElementTree
 import zlib
 
@@ -2118,6 +2119,9 @@ def replace_insane(char):
             return '_'
         return char
 
+    # Replace look-alike Unicode glyphs
+    if restricted and not is_id:
+        s = unicodedata.normalize('NFKC', s)
     # Handle timestamps
     s = re.sub(r'[0-9]+(?::[0-9]+)+', lambda m: m.group(0).replace(':', '_'), s)
     result = ''.join(map(replace_insane, s))