From 296b50bb77ea6471a40d442dc24a853a1adcd289 Mon Sep 17 00:00:00 2001
From: Sergey Linev <S.Linev@gsi.de>
Date: Fri, 5 Jun 2026 10:58:40 +0200
Subject: [PATCH] [gpad] transparent canvas color on Mac

When transparent style is specified,
canvas must be filled with 1001 fill style
to properly clear all previous drawings.

Logic was previosely implemented in TPad::PaintBox
and was not properly moved to TPad::PaintBorder

(cherry picked from commit aeefe7cab09f175b90b7c8788a794c3bfa03709e)
---
 graf2d/gpad/src/TPad.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/graf2d/gpad/src/TPad.cxx b/graf2d/gpad/src/TPad.cxx
index c73d996d5e070..856384ddf6018 100644
--- a/graf2d/gpad/src/TPad.cxx
+++ b/graf2d/gpad/src/TPad.cxx
@@ -3680,7 +3680,9 @@ void TPad::PaintBorder(Color_t color, Bool_t /* tops */)
             pp->SetAttFill({color, 1001}); // use fill color producing opacity
             pp->SetOpacity(style - 4000);
          }
-      } else if ((color == 10) && (style > 3000) && (style < 3100))
+      } else if ((style >= 4000) && (style <= 4100) && pp->IsCocoa() && (this == fMother))
+         style = 1001;
+      else if ((color == 10) && (style > 3000) && (style < 3100))
          color = 1;
 
       if (do_paint_box) {