From 5109ea0cf1385937744457bfbb6ec6e1edca7734 Mon Sep 17 00:00:00 2001
From: Joe <33972521+hnb-ku@users.noreply.github.com>
Date: Mon, 6 Jun 2022 22:20:29 +0800
Subject: [PATCH] UX: don't tether popper to the viewport if reference is out
 of the viewport (#17012)

followup to

https://github.com/discourse/discourse/pull/16504

Internal

`/t/64811`

public

`/t/228953`
---
 .../javascripts/select-kit/addon/components/select-kit.js       | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/app/assets/javascripts/select-kit/addon/components/select-kit.js b/app/assets/javascripts/select-kit/addon/components/select-kit.js
index ff6308e1dca..fe35f520641 100644
--- a/app/assets/javascripts/select-kit/addon/components/select-kit.js
+++ b/app/assets/javascripts/select-kit/addon/components/select-kit.js
@@ -889,6 +889,8 @@ export default Component.extend(
               name: "preventOverflow",
               options: {
                 altAxis: !this?.site?.mobileView,
+                tetherOffset: ({ reference }) =>
+                  Math.max(reference.y, document.documentElement.scrollTop),
               },
             },
             {