WIP V3: editing header rows works

app/playlistmodel.py

@@ -375,6 +375,11 @@ class PlaylistModel(QAbstractTableModel):
         Return text for editing
         """
 
+        # If this is a header row and we're being asked for the
+        # HEADER_NOTES_COLUMN, return the note value
+        if self.is_header_row(row) and column == HEADER_NOTES_COLUMN:
+            return QVariant(prd.note)
+
         if column == Col.TITLE.value:
             return QVariant(prd.title)
         if column == Col.ARTIST.value: