[meld: 5/8] added comment

[Kai Willadsen <kaiw src gnome org>]

commit 3ac9613eb58668ee506f7f68dda29dac52109d3b
Author: DAB <dab dab la>
Date:   Thu Jan 6 19:59:57 2022 -0500

    added comment

 meld/dirdiff.py | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/meld/dirdiff.py b/meld/dirdiff.py
index 325628ea..d168423e 100644
--- a/meld/dirdiff.py
+++ b/meld/dirdiff.py
@@ -283,6 +283,8 @@ class CanonicalListing:
         if self.compare.ignore_case:
             ci = ci.lower()
         if self.compare.normalize_encoding:
+            # NFC or NFD will work here, changing all composed or decomposed
+            # characters to the same set for matching only.
             ci = unicodedata.normalize('NFC', ci)
 
         # add the item to the comparison tree