[gtk+] GDK W32: Ensure that selection request is processed

[Руслан Ижбулатов <ruslanizhb src gnome org>]

commit 5d0bfdd840ce4be70f09625f35233b377de228d2
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 daba91e..ab10892 100644
--- a/gdk/win32/gdkdnd-win32.c
+++ b/gdk/win32/gdkdnd-win32.c
@@ -1042,6 +1042,7 @@ 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)));
@@ -1105,10 +1106,12 @@ 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 a164bb9..879b90d 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
     {