commit c2f88373e76b8c62ac2e2baed6bc1f0f20036401
Author: nicm <nicm>
Date:   Tue Oct 18 07:38:16 2016 +0000

    Store the right size in the pipe offset for pipe-pane.

diff --git a/window.c b/window.c
index 2c221f4390..8ef54084a7 100644
--- a/window.c
+++ b/window.c
@@ -970,7 +970,7 @@ window_pane_read_callback(__unused struct bufferevent *bufev, void *data)
 
 	input_parse(wp);
 
-	wp->pipe_off = size;
+	wp->pipe_off = EVBUFFER_LENGTH(evb);
 }
 
 static void