[gtk+] GDK W32: Print error code along with the error message

[Руслан Ижбулатов <ruslanizhb src gnome org>]

commit 692c3b11ff3877de90b653536d13dafc4e879ab8
Author: Руслан Ижбулатов <lrn1986 gmail com>
Date:   Mon Mar 21 16:25:19 2016 +0000

    GDK W32: Print error code along with the error message
    
    Error codes can be easily looked up in an error code list
    and/or googled up. Error messages, while descriptive, often
    describe the wrong thing, and the messages themselves are not
    part of the documentation of a function, unlike error codes.
    It would be preferable to have the code, or both.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=763913

 gdk/win32/gdkmain-win32.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/gdk/win32/gdkmain-win32.c b/gdk/win32/gdkmain-win32.c
index a8a7650..b170612 100644
--- a/gdk/win32/gdkmain-win32.c
+++ b/gdk/win32/gdkmain-win32.c
@@ -134,10 +134,11 @@ _gdk_win32_windowing_init (void)
 
 void
 _gdk_win32_api_failed (const gchar *where,
-                     const gchar *api)
+                       const gchar *api)
 {
-  gchar *msg = g_win32_error_message (GetLastError ());
-  g_warning ("%s: %s failed: %s", where, api, msg);
+  DWORD error_code = GetLastError ();
+  gchar *msg = g_win32_error_message (error_code);
+  g_warning ("%s: %s failed with code %lu: %s", where, api, error_code, msg);
   g_free (msg);
 }