mail/envelope: add a special class for headers

Handle multiple headers with ordering and case-insensitive operations.

1 files changed, 2 insertions, 2 deletions

diff --git a/alot/commands/envelope.py b/alot/commands/envelope.py
index 4b485425..5dce6b44 100644
--- a/alot/commands/envelope.py
+++ b/alot/commands/envelope.py
@@ -369,9 +369,9 @@ class EditCommand(Command):
         headertext = ''
         for key in edit_headers:
             vlist = self.envelope.get_all(key)
-            if not vlist:
+            if len(vlist) == 0:
                 # ensure editable headers are present in template
-                vlist = ['']
+                vlist.append('')
             else:
                 # remove to be edited lines from envelope
                 del self.envelope[key]