notmuch restore: Fix to remove all tags before adding tags.

This means that the restore operation will now properly pick up the
removal of tags indicated by the tag just not being present in the
dump file.

We added a few new public functions in order to support this:

	notmuch_message_freeze
	notmuch_message_remove_all_tags
	notmuch_message_thaw

1 files changed, 6 insertions, 0 deletions

diff --git a/notmuch.c b/notmuch.c
index 3b0182a9..d716bce3 100644
--- a/notmuch.c
+++ b/notmuch.c
@@ -287,6 +287,7 @@ add_files_recursive (notmuch_database_t *notmuch,
 		    case NOTMUCH_STATUS_FILE_ERROR:
 		    case NOTMUCH_STATUS_NULL_POINTER:
 		    case NOTMUCH_STATUS_TAG_TOO_LONG:
+		    case NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW:
 		    case NOTMUCH_STATUS_LAST_STATUS:
 			INTERNAL_ERROR ("add_message returned unexpected value: %d",  status);
 			goto DONE;
@@ -854,6 +855,10 @@ restore_command (int argc, char *argv[])
 		goto NEXT_LINE;
 	    }
 
+	    notmuch_message_freeze (message);
+
+	    notmuch_message_remove_all_tags (message);
+
 	    next = tags;
 	    while (next) {
 		tag = strsep (&next, " ");
@@ -869,6 +874,7 @@ restore_command (int argc, char *argv[])
 		}
 	    }
 
+	    notmuch_message_thaw (message);
 	    notmuch_message_destroy (message);
 	}
       NEXT_LINE: