From f68dee3288202259fb2b417a590c462e3f4ff658 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Fri, 20 Dec 2019 10:59:19 +0100
Subject: Fix problems after closing full-screen window

macOS strangely sends NSViewFrameDidChangeNotification and a drawRect: message to its content view
after having sent to the window the close message. That is apparently new in 10.15.2
---
 src/Fl_cocoa.mm | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index 03691956a..b0a13d714 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -1250,7 +1250,7 @@ static FLWindowDelegate *flwindowdelegate_instance = nil;
   if (![[notif object] isKindOfClass:[FLView class]]) return;
   FLView *view = (FLView*)[notif object];
   FLWindow *nsw = (FLWindow*)[view window];
-  if (!nsw) return;
+  if (!nsw || ![nsw getFl_Window]) return;
   fl_lock_function();
   Fl_Window *window = [nsw getFl_Window];
   int X, Y;
@@ -2234,9 +2234,10 @@ static FLTextInputContext* fltextinputcontext_instance = nil;
  */
 - (void)drawRect:(NSRect)rect
 {
-  fl_lock_function();
   FLWindow *cw = (FLWindow*)[self window];
   Fl_Window *window = [cw getFl_Window];
+  if (!window) return; // may happen after closing full-screen window
+  fl_lock_function();
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
   CGContextRef gc = views_use_CA ? [[NSGraphicsContext currentContext] CGContext] : NULL;
 #endif
-- 
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