gentoo-overlay/app-misc/tmux/files/tmux-2.3-pipe_pane-fix.patch

--- a/window.c	2016-09-29 05:31:24.000000000 +0800
+++ b/window.c	2017-12-22 09:38:43.709617000 +0800
@@ -981,7 +981,7 @@

 	input_parse(wp);

-	wp->pipe_off = size;
+	wp->pipe_off = EVBUFFER_LENGTH(evb);
 }