[gtk/wip/chergert/gdk-macos-fixes: 2/3] macos: use simple monotonic for event serial

[Christian Hergert <chergert src gnome org>]

commit d5b5410b8f319af0db50ef62136f7da38090808d
Author: Christian Hergert <chergert redhat com>
Date:   Tue Oct 13 15:03:44 2020 -0700

    macos: use simple monotonic for event serial

 gdk/macos/gdkmacosdisplay-translate.c | 3 ++-
 gdk/macos/gdkmacosdisplay.c           | 8 +++++---
 2 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/gdk/macos/gdkmacosdisplay-translate.c b/gdk/macos/gdkmacosdisplay-translate.c
index 329f20b0dd..50497320f7 100644
--- a/gdk/macos/gdkmacosdisplay-translate.c
+++ b/gdk/macos/gdkmacosdisplay-translate.c
@@ -1179,7 +1179,8 @@ _gdk_macos_display_synthesize_motion (GdkMacosDisplay *self,
                                 y,
                                 NULL);
   node = _gdk_event_queue_append (GDK_DISPLAY (self), event);
-  _gdk_windowing_got_event (GDK_DISPLAY (self), node, event, 0);
+  _gdk_windowing_got_event (GDK_DISPLAY (self), node, event,
+                            _gdk_display_get_next_serial (GDK_DISPLAY (self)));
 }
 
 void
diff --git a/gdk/macos/gdkmacosdisplay.c b/gdk/macos/gdkmacosdisplay.c
index 78af1cefce..6a89def8c1 100644
--- a/gdk/macos/gdkmacosdisplay.c
+++ b/gdk/macos/gdkmacosdisplay.c
@@ -380,7 +380,8 @@ gdk_macos_display_sync (GdkDisplay *display)
 static gulong
 gdk_macos_display_get_next_serial (GdkDisplay *display)
 {
-  return 0;
+  static gulong serial = 0;
+  return ++serial;
 }
 
 static gboolean
@@ -437,7 +438,7 @@ gdk_macos_display_queue_events (GdkDisplay *display)
           _gdk_windowing_got_event (GDK_DISPLAY (self),
                                     _gdk_event_queue_append (GDK_DISPLAY (self), event),
                                     event,
-                                    0);
+                                    _gdk_display_get_next_serial (GDK_DISPLAY (self)));
         }
       else
         {
@@ -900,7 +901,8 @@ _gdk_macos_display_break_all_grabs (GdkMacosDisplay *self,
                                              grab->surface,
                                              TRUE);
           node = _gdk_event_queue_append (GDK_DISPLAY (self), event);
-          _gdk_windowing_got_event (GDK_DISPLAY (self), node, event, 0);
+          _gdk_windowing_got_event (GDK_DISPLAY (self), node, event,
+                                    _gdk_display_get_next_serial (GDK_DISPLAY (self)));
         }
     }
 }