limit find&replace fields to selected notes

anki/find.py

@@ -539,6 +539,19 @@ def fieldNames(col, downcase=True):
         return list(fields)
     return names
 
+def fieldNamesForNotes(col, nids):
+    downcasedNames = set()
+    origNames = []
+    mids = col.db.list("select distinct mid from notes where id in %s" % ids2str(nids))
+    for mid in mids:
+        model = col.models.get(mid)
+        for field in col.models.fieldNames(model):
+            if field.lower() not in downcasedNames:
+                downcasedNames.add(field.lower())
+                origNames.append(field)
+
+    return sorted(origNames, key=lambda x: x.lower())
+
 # Find duplicates
 ##########################################################################
 # returns array of ("dupestr", [nids])

aqt/browser.py

@@ -1717,7 +1717,7 @@ update cards set usn=?, mod=?, did=? where id in """ + scids,
         if not sf:
             return
         import anki.find
-        fields = sorted(anki.find.fieldNames(self.col, downcase=False))
+        fields = anki.find.fieldNamesForNotes(self.mw.col, sf)
         d = QDialog(self)
         frm = aqt.forms.findreplace.Ui_Dialog()
         frm.setupUi(d)