From 4ab7de74fe028797a08fdff03a67c85bb0f87229 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Mon, 28 Sep 2026 11:29:40 +0100
Subject: [PATCH] Test for 5645.

(cherry picked from commit 797d7c176e3c497fedb613198c6fc5ce44e7b1ea)
---
 regress/floating-pane-top-border-drag.sh | 87 ++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100755 regress/floating-pane-top-border-drag.sh

diff --git a/regress/floating-pane-top-border-drag.sh b/regress/floating-pane-top-border-drag.sh
new file mode 100755
index 000000000..609d91ee9
--- /dev/null
+++ b/regress/floating-pane-top-border-drag.sh
@@ -0,0 +1,87 @@
+#!/bin/sh
+
+# With pane-border-status top, a tiled pane's status line is on the top row of
+# the window. A floating pane dragged to the top of the window has its own top
+# border on the same row, so it must still be draggable by that border rather
+# than the click going to the tiled pane underneath.
+
+PATH=/bin:/usr/bin
+TERM=screen
+LC_ALL=C.UTF-8
+export PATH TERM LC_ALL
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+
+TMUX="$TEST_TMUX -Ltopborder-inner-$$ -f/dev/null"
+TMUX2="$TEST_TMUX -Ltopborder-outer-$$ -f/dev/null"
+
+fail()
+{
+	echo "$*" >&2
+	exit 1
+}
+
+cleanup()
+{
+	$TMUX2 kill-server 2>/dev/null
+	$TMUX kill-server 2>/dev/null
+}
+trap cleanup 0 1 15
+
+# Press, drag and release with SGR mouse sequences, sent as 1-based positions
+# to the outer pane holding the inner client. This matches the default
+# MouseDown1Border/MouseDrag1Border bindings used to move a floating pane by
+# its border.
+drag()
+{
+	seq=$(printf '\033[<0;%s;%sM' "$1" "$2")
+	$TMUX2 send-keys -t "$OUTER" -l "$seq" 2>/dev/null
+	sleep 0.2
+	seq=$(printf '\033[<32;%s;%sM' "$3" "$4")
+	$TMUX2 send-keys -t "$OUTER" -l "$seq" 2>/dev/null
+	sleep 0.2
+	seq=$(printf '\033[<0;%s;%sm' "$3" "$4")
+	$TMUX2 send-keys -t "$OUTER" -l "$seq" 2>/dev/null
+	sleep 0.5
+}
+
+pane_top()
+{
+	$TMUX display-message -p -t "$FLOAT" '#{pane_top}'
+}
+
+$TMUX new-session -d -s inner -x 60 -y 20 'sleep 100' || exit 1
+$TMUX set -g status off || exit 1
+$TMUX set -g window-size manual || exit 1
+$TMUX set -g mouse on || exit 1
+$TMUX set -g pane-border-status top || exit 1
+
+FLOAT=$($TMUX new-pane -d -PF '#{pane_id}' -x 20 -y 8 -X 15 -Y 8 'sleep 100') ||
+    fail "new-pane failed"
+FLEFT=$($TMUX display-message -p -t "$FLOAT" '#{pane_left}')
+COL=$((FLEFT + 6))
+
+$TMUX2 new-session -d -s outer -x 60 -y 20 "$TMUX attach -t inner" || exit 1
+sleep 1
+OUTER=$($TMUX2 list-panes -F '#{pane_id}' | head -1)
+[ -n "$OUTER" ] || fail "no outer pane"
+
+# Drag the floating pane up by its top border until it reaches the top of the
+# window, where the border shares a row with the tiled pane's status line.
+i=0
+while [ "$(pane_top)" -gt 1 ] && [ "$i" -lt 10 ]; do
+	top=$(pane_top)
+	# The border is on row top-1 (0-based); positions are 1-based.
+	dest=$((top - 3))
+	[ "$dest" -lt 1 ] && dest=1
+	drag $((COL + 1)) "$top" $((COL + 1)) "$dest"
+	i=$((i + 1))
+done
+[ "$(pane_top)" -eq 1 ] || fail "could not drag the pane to the top ($(pane_top))"
+
+# Now drag it back down by the top border in row 0.
+drag $((COL + 1)) 1 $((COL + 1)) 4
+[ "$(pane_top)" -gt 1 ] ||
+    fail "floating pane at the top could not be dragged by its top border"
+
+exit 0