From aeb25ba52161ef6e50c0cd67df985f2712bcae55 Mon Sep 17 00:00:00 2001
From: Chris Rebert <code@chrisrebert.com>
Date: Tue, 22 Dec 2015 23:21:51 -0700
Subject: [PATCH] Modal: Ignore spurious `focus` event that Firefox fires at
 `document` when switching back to its tab

Fixes #18365
Ports #18638 to v3
Refs https://bugzilla.mozilla.org/show_bug.cgi?id=1228802
---
 js/modal.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/js/modal.js b/js/modal.js
index 5049cccf36..cba48507a4 100644
--- a/js/modal.js
+++ b/js/modal.js
@@ -140,7 +140,9 @@
     $(document)
       .off('focusin.bs.modal') // guard against infinite focus loop
       .on('focusin.bs.modal', $.proxy(function (e) {
-        if (this.$element[0] !== e.target && !this.$element.has(e.target).length) {
+        if (document !== event.target &&
+            this.$element[0] !== e.target &&
+            !this.$element.has(e.target).length) {
           this.$element.trigger('focus')
         }
       }, this))
-- 
2.47.2