From 86a2142ded019b76fa878e80c35b9b37c18a145b Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Mon, 5 Oct 2026 09:41:50 +0100
Subject: [PATCH] Test for 5684 from mml00 dot work at gmail dot com.

---
 regress/alternate-screen-resize.sh | 34 ++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 regress/alternate-screen-resize.sh

diff --git a/regress/alternate-screen-resize.sh b/regress/alternate-screen-resize.sh
new file mode 100644
index 000000000..c9016336a
--- /dev/null
+++ b/regress/alternate-screen-resize.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+
+# A pending pane resize must still reach the pty when the application enters
+# the alternate screen before the resize timer fires.
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest$$ -f/dev/null"
+
+TMP=$(mktemp)
+TMP2=$(mktemp)
+trap 'rm -f "$TMP" "$TMP2"; $TMUX kill-server 2>/dev/null' 0 1 15
+
+$TMUX new -d -x 80 -y 24 \
+	"read x; printf '\033[?1049h'; read x; stty size >$TMP; sleep 100" \
+	</dev/null || exit 1
+sleep 1
+
+# The first split resizes and starts the resize timer, the second queues
+# another resize while the timer is pending.
+$TMUX splitw -h -d 'sleep 100' || exit 1
+$TMUX splitw -v -d -t:0.0 'sleep 100' || exit 1
+$TMUX send -t:0.0 Enter || exit 1
+sleep 1
+
+$TMUX send -t:0.0 Enter || exit 1
+sleep 1
+$TMUX display -p -t:0.0 '#{pane_height} #{pane_width}' >$TMP2
+cmp -s "$TMP" "$TMP2" || exit 1
+
+$TMUX kill-server 2>/dev/null
+exit 0