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-rw-r--r--tmux.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/tmux.h b/tmux.h
index 72be101b..2315f643 100644
--- a/tmux.h
+++ b/tmux.h
@@ -2689,6 +2689,7 @@ void session_group_add(struct session_group *, struct session *);
void session_group_synchronize_to(struct session *);
void session_group_synchronize_from(struct session *);
u_int session_group_count(struct session_group *);
+u_int session_group_attached_count(struct session_group *);
void session_renumber_windows(struct session *);
/* utf8.c */