[gtk/quartz-openfile-fix] quartz: gtk-application - inhibit openFiles events from cmdline

[Matthias Clasen <matthiasc src gnome org>]

commit a614716d0fd2fa6c157ba35ea5013468a2b93a19
Author: Friedrich Beckmann <friedrich beckmann gmx de>
Date:   Thu Jun 18 21:08:28 2020 +0200

    quartz: gtk-application - inhibit openFiles events from cmdline
    
    When an application is started via cmdline, then openFiles events
    from MacOS are generated although gtkapplication already interprets
    the cmdline arguments and opens suitable arguments as files. So they
    would be opened twice. Depending on the exact situation the
    openFiles event can also be issued before the startup signal
    is given. Depending on the application this can result in a crash
    due to unexpected behaviour. I took this idea from the
    gedit-app-osx.m file. Also from Jesse van den Kieboom.
    
    See:
    https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/2098#note_842975
    https://gitlab.gnome.org/GNOME/gtk/-/commit/a3ad7fa80f764fb7bcbe
    https://gitlab.gnome.org/GNOME/gedit/-/blob/master/gedit/gedit-app-osx.m#L592

 gtk/gtkapplication-quartz.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/gtk/gtkapplication-quartz.c b/gtk/gtkapplication-quartz.c
index 90ab1705f0..d59a19b1e2 100644
--- a/gtk/gtkapplication-quartz.c
+++ b/gtk/gtkapplication-quartz.c
@@ -325,6 +325,13 @@ gtk_application_impl_quartz_uninhibit (GtkApplicationImpl *impl,
 static void
 gtk_application_impl_quartz_init (GtkApplicationImplQuartz *quartz)
 {
+  /* This is required so that Cocoa is not going to parse the
+     command line arguments by itself and generate OpenFile events.
+     We already parse the command line ourselves, so this is needed
+     to prevent opening files twice, etc. */
+  [[NSUserDefaults standardUserDefaults] setObject:@"NO"
+                                            forKey:@"NSTreatUnknownArgumentsAsOpen"];
+
   quartz->combined = g_menu_new ();
 }