From ab9fd0f503f6f8225b13f9637971c1fb0bdb428a Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Thu, 30 Jan 2025 16:47:57 +0100
Subject: [PATCH] macOS: add support of showing window to multi-screen
 fullscreen state

---
 src/Fl_cocoa.mm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index 8095447a8..a045d07ea 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -3272,7 +3272,14 @@ void Fl_Cocoa_Window_Driver::makeWindow()
     if ([cw canBecomeKeyWindow]) [cw makeKeyAndOrderFront:nil];
     else [cw orderFront:nil];
     if (w->fullscreen_active() && fl_mac_os_version >= 100700) {
-      [cw toggleFullScreen:nil];
+      if (fullscreen_screen_top() >= 0)  {
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
+        cw.collectionBehavior |= NSWindowCollectionBehaviorFullScreenNone;
+#endif
+        *no_fullscreen_x() = pWindow->x();
+        *no_fullscreen_y() = pWindow->y();
+      }
+      fullscreen_on();
     }
   }
   if (fl_sys_menu_bar && Fl_MacOS_Sys_Menu_Bar_Driver::window_menu_style() && !w->parent() && w->border() &&
-- 
GitLab