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-rw-r--r--filter/filter-rule.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/filter/filter-rule.h b/filter/filter-rule.h
index 2d5ba8174a..956b9cbcb4 100644
--- a/filter/filter-rule.h
+++ b/filter/filter-rule.h
@@ -51,6 +51,7 @@ enum _filter_threading_t {
FILTER_THREAD_ALL, /* add all possible threads */
FILTER_THREAD_REPLIES, /* add only replies */
FILTER_THREAD_REPLIES_PARENTS, /* replies plus parents */
+ FILTER_THREAD_SINGLE, /* messages with no replies or parents */
};
#define FILTER_SOURCE_INCOMING "incoming" /* performed on incoming email */