From 8bf62c67cfb8349064e2d2104ce9049a233fd914 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Mon, 6 Dec 2021 10:18:13 +0100
Subject: macOS platform: compute the screen number where a top window is
 mapped.

---
 src/Fl_cocoa.mm | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/Fl_cocoa.mm')

diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index 5cf74ea3e..b415e8d4b 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -1234,6 +1234,10 @@ static FLWindowDelegate *flwindowdelegate_instance = nil;
     if (window->parent()) [nsw recursivelySendToSubwindows:@selector(checkSubwindowFrame) applyToSelf:YES];
     starting_moved_window = NULL;
   }
+  if (!window->parent()) {
+    int nscreen = Fl::screen_num(window->x(), window->y(), window->w(), window->h());
+    Fl_Window_Driver::driver(window)->screen_num(nscreen);
+  }
   fl_unlock_function();
 }
 - (void)view_did_resize:(NSNotification *)notif
-- 
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