notmuch restore: only delete a message's old tags if they are not a subset of the new ones.

1 files changed, 2 insertions, 1 deletions

diff --git a/notmuch b/notmuch
index d28c6ea4..e4e07bcf 100755
--- a/notmuch
+++ b/notmuch
@@ -235,7 +235,8 @@ if __name__ == '__main__':
 
          #set the new tags
          msg.freeze()
-         msg.remove_all_tags()
+         #only remove tags if the new ones are not a superset anyway
+         if not (new_tags > old_tags): msg.remove_all_tags()
          for tag in new_tags: msg.add_tag(tag)
          msg.thaw()