From 04f32073c0e1cea022634823b4fca5e2afd95405 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 1 Dec 2025 08:04:26 +0000
Subject: [PATCH] Add horizontal border case to
 server_client_check_mouse_in_pane to fix mouse resizing. GitHub issue 4720
 from Michael Grant, reported by someone in GitHub issue 4715.

---
 server-client.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/server-client.c b/server-client.c
index 184717a4..a48b9802 100644
--- a/server-client.c
+++ b/server-client.c
@@ -617,7 +617,8 @@ server_client_check_mouse_in_pane(struct window_pane *wp, u_int px, u_int py,
 		line = wp->yoff + wp->sy;
 
 	/* Check if point is within the pane or scrollbar. */
-	if (((pane_status != PANE_STATUS_OFF && py != line) ||
+	if (((pane_status != PANE_STATUS_OFF &&
+	    py != line && py != wp->yoff + wp->sy) ||
 	    (wp->yoff == 0 && py < wp->sy) ||
 	    (py >= wp->yoff && py < wp->yoff + wp->sy)) &&
 	    ((sb_pos == PANE_SCROLLBARS_RIGHT &&