[gtk+/quartz-integration: 13/14] Use a synthesized mouse nsevent to start a drag instead of grabbing the most recent event from the n

[John Ralls <jralls src gnome org>]

commit 0f07f624bc637c351b0e178b4e3ee1e9bdc22421
Author: John Ralls <jralls ceridwen us>
Date:   Sat Jan 8 10:13:49 2011 -0800

    Use a synthesized mouse nsevent to start a drag instead of grabbing the most recent event from the nswindow (which may well not be the right event).

 gtk/gtkdnd-quartz.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkdnd-quartz.c b/gtk/gtkdnd-quartz.c
index c357507..4f25236 100644
--- a/gtk/gtkdnd-quartz.c
+++ b/gtk/gtkdnd-quartz.c
@@ -1118,13 +1118,18 @@ gtk_drag_begin_internal (GtkWidget         *widget,
 {
   GtkDragSourceInfo *info;
   GdkDragContext *context;
-/* FIXME: This is a bit of a race condition, because there's a fairly
- * large delay between receiving a motion event and the application
- * deciding that it's a drag during which time the NSWindow might have
- * registered another NSEvent. */
   NSWindow *nswindow = get_toplevel_nswindow (widget);
-  NSEvent *nsevent = [nswindow currentEvent];
-
+  NSPoint point = {(double)event->motion.x, (double)event->motion.y};
+  NSEvent *nsevent = [NSEvent mouseEventWithType: NSLeftMouseDown
+		      location: point
+		      modifierFlags: 0
+		      timestamp: event->motion.time
+		      windowNumber: [nswindow windowNumber]
+		      context: [nswindow graphicsContext]
+		      eventNumber: 0
+		      clickCount: 1
+		      pressure: 0.0 ];
+  g_return_val_if_fail(nsevent != NULL, NULL);
   context = gdk_drag_begin (gtk_widget_get_window (widget), NULL);
 /* If we've already started a drag, gdk_drag_begin will return NULL;
  * we don't want to do anything in that event. */