From 89d3067dd4b001320eca8e35b2d1c4f9968a6196 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Tue, 21 Oct 2025 16:43:04 +0200
Subject: [PATCH] fix: `trafficLightPosition` incorrect with
 `customButtonsOnHover` (#48538)

fix: trafficLightPosition incorrect with customButtonsOnHover
---
 shell/browser/ui/cocoa/window_buttons_proxy.mm | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/shell/browser/ui/cocoa/window_buttons_proxy.mm b/shell/browser/ui/cocoa/window_buttons_proxy.mm
index de1d6b4630..c0dfd0ac58 100644
--- a/shell/browser/ui/cocoa/window_buttons_proxy.mm
+++ b/shell/browser/ui/cocoa/window_buttons_proxy.mm
@@ -176,6 +176,13 @@
     [button setHidden:hidden];
     [button setNeedsDisplay:YES];
   }
+
+  // On macOS 26, toggling the hidden state of the standard window buttons can
+  // cause AppKit to re-layout the title bar container and reset its frame,
+  // which loses the custom margin adjustments. Re-apply the calculated geometry
+  // after visibility changes to keep the buttons at the specified margin
+  // instead of snapping back to the default until the next manual resize.
+  [self redraw];
 }
 
 // Return the bounds of all 3 buttons.