flags use the memstore

* add new/dirty deferred dict to notify when written to disk
* fix eventual duplication after copy
* fix flag flickering on first retrieval.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/leap/mail/utils.py b/src/leap/mail/utils.py
index 64af04f..bae2898 100644
--- a/src/leap/mail/utils.py
+++ b/src/leap/mail/utils.py
@@ -36,6 +36,15 @@ def first(things):
         return None
 
 
+def empty(thing):
+    """
+    Return True if a thing is None or its length is zero.
+    """
+    if thing is None:
+        return True
+    return len(thing) == 0
+
+
 def maybe_call(thing):
     """
     Return the same thing, or the result of its invocation if it is a