Add comment to highlight conflict prevention

We use dark magic to prevent illegal chars on a range of filesystems,
same as the omemo library uses. Maybe that should be abstracted away.

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

poezio_omemo/__init__.py

@@ -70,9 +70,11 @@ class Plugin(E2EEPlugin):
 
         self.info = lambda i: self.api.information(i, 'Info')
 
+        # Ensure folder names don't contain illegal chars for the FS
         jid_str = self.core.xmpp.boundjid.bare.encode('utf-8')
         digest = hashlib.sha256(jid_str).digest()
         hashed_jid = base64.b32encode(digest).decode('US-ASCII')
+
         data_dir = os.path.join(DATA_HOME, 'omemo', hashed_jid)
 
         try: