From 8106ae7923a4a94949435b65aca0aad303215432 Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <michael@stapelberg.de>
Date: Sun, 20 Aug 2017 12:14:12 +0200
Subject: [PATCH] i3bar: Bugfix: avoid freeze after VisibilityNotify

fixes #2790
---
 i3bar/src/xcb.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/i3bar/src/xcb.c b/i3bar/src/xcb.c
index 3bd5677a..2ba446b1 100644
--- a/i3bar/src/xcb.c
+++ b/i3bar/src/xcb.c
@@ -1255,6 +1255,12 @@ char *init_xcb_early() {
     ev_prepare_init(xcb_prep, &xcb_prep_cb);
     ev_check_init(xcb_chk, &xcb_chk_cb);
 
+    /* Within an event loop iteration, run the xcb_chk watcher last: other
+     * watchers might call xcb_flush(), which, unexpectedly, can also read
+     * events into the queue (see _xcb_conn_wait). Hence, we need to drain xcb’s
+     * queue last, otherwise we risk dead-locking. */
+    ev_set_priority(xcb_chk, EV_MINPRI);
+
     ev_io_start(main_loop, xcb_io);
     ev_prepare_start(main_loop, xcb_prep);
     ev_check_start(main_loop, xcb_chk);