From 0ac13799853e87c331fc99f7387a5d5603c5820b Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Thu, 31 Oct 2024 15:15:33 +0100
Subject: macOS: prevent changing window border while window is fullscreen

---
 src/Fl_cocoa.mm | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src')

diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index 9b4e004ce..01995984b 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -3403,6 +3403,17 @@ void Fl_Cocoa_Window_Driver::use_border() {
   if (!shown() || pWindow->parent()) return;
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
   if (fl_mac_os_version >= 100600) {
+    if (pWindow->fullscreen_active()) {
+      // prevent changing border while window is fullscreen
+      static bool active = false;
+      if (!active) {
+        active = true;
+        bool b = !border();
+        pWindow->border(b);
+        active = false;
+      }
+      return;
+    }
     [fl_xid(pWindow) setStyleMask:calc_win_style(pWindow)]; // 10.6
     if (border()) restore_window_title_and_icon(pWindow, icon_image);
     pWindow->redraw();
-- 
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