[gtk/gtk-3-24-fix-minimize] Update gdkwindow-quartz.c

[Alex Samorukov <asamorukov src gnome org>]

commit 92c02021b432570cb6c6feae7016f6a9e256ad05
Author: Alex Samorukov <samm net-art cz>
Date:   Sat Jan 4 11:49:27 2020 +0000

    Update gdkwindow-quartz.c

 gdk/quartz/gdkwindow-quartz.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gdk/quartz/gdkwindow-quartz.c b/gdk/quartz/gdkwindow-quartz.c
index eb4ec690e8..8c00e915fe 100644
--- a/gdk/quartz/gdkwindow-quartz.c
+++ b/gdk/quartz/gdkwindow-quartz.c
@@ -2408,7 +2408,8 @@ gdk_quartz_window_set_decorations (GdkWindow       *window,
   if (decorations == 0 || GDK_WINDOW_TYPE (window) == GDK_WINDOW_TEMP ||
       impl->type_hint == GDK_WINDOW_TYPE_HINT_SPLASHSCREEN )
     {
-      new_mask = GDK_QUARTZ_BORDERLESS_WINDOW;
+      /* without GDK_QUARTZ_MINIATURIZABLE_WINDOW it is not possible to minimize window */
+      new_mask = GDK_QUARTZ_BORDERLESS_WINDOW | GDK_QUARTZ_MINIATURIZABLE_WINDOW;
     }
   else
     {