ensure fields normalized before checksumming

https://forums.ankiweb.net/t/python-checksum-rust-checksum/8195

pylib/anki/utils.py

@@ -15,6 +15,7 @@
 import tempfile
 import time
 import traceback
+import unicodedata
 from contextlib import contextmanager
 from hashlib import sha1
 from html.entities import name2codepoint
@@ -201,8 +202,11 @@ def checksum(data: Union[bytes, str]) -> str:
 
 
 def fieldChecksum(data: str) -> int:
+    without_html = stripHTMLMedia(data)
+    normalized = unicodedata.normalize("NFC", without_html)
+    utf8_text = normalized.encode("utf-8")
     # 32 bit unsigned number from first 8 digits of sha1 hash
-    return int(checksum(stripHTMLMedia(data).encode("utf-8"))[:8], 16)
+    return int(checksum(utf8_text)[:8], 16)
 
 
 # Temp files