[gtk+/gtk-3-22] GDK W32: Ensure that selection request is processed

[Руслан Ижбулатов <ruslanizhb src gnome org>]

commit 934ac3f6ef26d3c842481a6ddc948339a55237ae
Author: Руслан Ижбулатов <lrn1986 gmail com>
Date:   Mon Sep 18 16:49:11 2017 +0000

    GDK W32: Ensure that selection request is processed
    
    To do that, run the message loop for one second or until the side-effect
    of running the selection request handler is achieved (as opposed to
    running it until the event is no longer queued).
    
    The disavantage of this method is that if the event handling is
    somehow missed (due to a variety of reasons - after all, it's not
    a straight path from an event being queued to property_change()
    being called), this will loop for one second. Since we do process
    events during that time, this will not hang the application, but
    might still restrict some of the functionality.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786509

 gdk/win32/gdkdnd-win32.c       |    9 ++++++---
 gdk/win32/gdkselection-win32.c |    3 +++
 2 files changed, 9 insertions(+), 3 deletions(-)
---
diff --git a/gdk/win32/gdkdnd-win32.c b/gdk/win32/gdkdnd-win32.c
index c14ca2e..0583c61 100644
--- a/gdk/win32/gdkdnd-win32.c
+++ b/gdk/win32/gdkdnd-win32.c
@@ -1030,6 +1030,7 @@ idataobject_getdata (LPDATAOBJECT This,
   GdkEvent e;
   gint i;
   GdkAtom target;
+  gint64 loopend;
 
   GDK_NOTE (DND, g_print ("idataobject_getdata %p %s ",
                          This, _gdk_win32_cf_to_string (pFormatEtc->cfFormat)));
@@ -1093,10 +1094,12 @@ idataobject_getdata (LPDATAOBJECT This,
 
   gdk_event_put (&e);
 
-  process_pending_events (gdk_device_get_display (gdk_drag_context_get_device (ctx->context)));
+  /* Don't hold up longer than one second */
+  loopend = g_get_monotonic_time () + 1000000000;
 
-  win32_sel->property_change_format = 0;
-  win32_sel->property_change_data = 0;
+  while (win32_sel->property_change_data != 0 &&
+         g_get_monotonic_time () < loopend)
+    process_pending_events (gdk_device_get_display (gdk_drag_context_get_device (ctx->context)));
 
   if (pMedium->hGlobal == NULL) {
     GDK_NOTE (DND, g_print (" E_UNEXPECTED\n"));
diff --git a/gdk/win32/gdkselection-win32.c b/gdk/win32/gdkselection-win32.c
index 86ff0d7..5fd02a6 100644
--- a/gdk/win32/gdkselection-win32.c
+++ b/gdk/win32/gdkselection-win32.c
@@ -2393,6 +2393,9 @@ _gdk_win32_selection_property_change (GdkWin32Selection *win32_sel,
 
           g_free (set_data);
         }
+
+      win32_sel->property_change_format = 0;
+      win32_sel->property_change_data = 0;
     }
   else
     {