Scale pane on unhiding to window when necessary

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

regress/status-pane-list-click.sh

@@ -0,0 +1,92 @@
+#!/bin/sh
+
+# Clicking a pane in the pane list on the second status line selects it, hides
+# it if it is already the active pane and shows it again if it is hidden. The
+# button at the right hides every floating and zoomed pane and, clicked again,
+# shows just those.
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -LtestA$$ -f/dev/null"
+TMUX2="$TEST_TMUX -LtestB$$ -f/dev/null"
+
+cleanup()
+{
+	$TMUX kill-server >/dev/null 2>&1
+	$TMUX2 kill-server >/dev/null 2>&1
+}
+fail()
+{
+	echo "$*" >&2
+	cleanup
+	exit 1
+}
+
+# click COL ROW
+#
+# Write an SGR mouse press then release at a 1-based position to the outer pane
+# holding the inner client.
+click()
+{
+	seq=$(printf '\033[<0;%s;%sM\033[<0;%s;%sm' "$1" "$2" "$1" "$2")
+	$TMUX2 send-keys -t "$OUTER" -l "$seq" || fail "send-keys failed."
+	sleep 1
+}
+
+# check PANE FORMAT EXPECTED
+check()
+{
+	got=$($TMUX display-message -p -t "$1" "$2")
+	[ "$got" = "$3" ] || fail "$1 $2: got '$got', expected '$3'"
+}
+
+cleanup
+
+$TMUX new-session -d -s inner -x 60 -y 12 'sleep 100' || exit 1
+$TMUX set -g mouse on || exit 1
+$TMUX set -g status 2 || exit 1
+a=$($TMUX display-message -p '#{pane_id}') || exit 1
+b=$($TMUX split-window -dPF '#{pane_id}' 'sleep 100') || exit 1
+f=$($TMUX new-pane -dPF '#{pane_id}' -x 20 -y 4 -X 20 -Y 2 'sleep 100') ||
+	exit 1
+
+$TMUX2 new-session -d -x 60 -y 12 "$TMUX attach -t inner" || exit 1
+sleep 1
+OUTER=$($TMUX2 list-panes -F '#{pane_id}' | head -1)
+[ -n "$OUTER" ] || fail "No outer pane."
+
+# The second status line is the last row: "  P: " then one entry per pane in
+# pane order (a, b, f), each about twelve columns wide, and the button at the
+# far right.
+row=12
+
+entry_b=24
+button=59
+
+# Clicking another pane selects it.
+check "$a" '#{pane_active}' 1
+click $entry_b $row
+check "$b" '#{pane_active}:#{pane_hidden_flag}' '1:0'
+
+# Clicking the active pane hides it and the focus moves to a visible pane.
+click $entry_b $row
+check "$b" '#{pane_hidden_flag}' 1
+check "$b" '#{pane_active}' 0
+
+# Clicking a hidden pane shows it and selects it.
+click $entry_b $row
+check "$b" '#{pane_hidden_flag}:#{pane_active}' '0:1'
+
+# The button hides the floating pane but not the tiled ones, then shows it.
+check "$f" '#{pane_hidden_flag}' 0
+click $button $row
+check "$f" '#{pane_hidden_flag}' 1
+check "$a" '#{pane_hidden_flag}' 0
+check "$b" '#{pane_hidden_flag}' 0
+click $button $row
+check "$f" '#{pane_hidden_flag}' 0
+
+cleanup
+exit 0