[glib] g_application_run(): Fix on Windows When Using Bindings

[Chun-wei Fan <fanchunwei src gnome org>]

commit bec6a9a3003d95077ad23c235a9313d79c6a1c4f
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Dec 21 14:54:42 2015 +0800

    g_application_run(): Fix on Windows When Using Bindings
    
    As g_win32_get_command_line() calls CommandLineToArgvW() to acquire the
    arguments passed into a GApplication program, it actually returns the
    whole command line which is used to invoke the program, including the
    script interpreter and its flags when a script using GNOME bindings
    (e.g. PyGObject and so on) is being invoked.
    
    The issue here is that g_application_run() would most probably have
    trouble in the scripts scenario on Windows as it is likely unable to
    "recognize" the script interpreter, causing such scripts to fail to run.
    
    Largely based on the patch by Ray Donnelly <mingw android gmail com>.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=734095

 gio/gapplication.c |   29 ++++++++++++++++++++++++++++-
 1 files changed, 28 insertions(+), 1 deletions(-)
---
diff --git a/gio/gapplication.c b/gio/gapplication.c
index e24ab69..9947e05 100644
--- a/gio/gapplication.c
+++ b/gio/gapplication.c
@@ -2277,7 +2277,34 @@ g_application_run (GApplication  *application,
   g_return_val_if_fail (!application->priv->must_quit_now, 1);
 
 #ifdef G_OS_WIN32
-  arguments = g_win32_get_command_line ();
+  {
+    gint new_argc = 0;
+
+    arguments = g_win32_get_command_line ();
+
+    /*
+     * CommandLineToArgvW(), which is called by g_win32_get_command_line(),
+     * pulls in the whole command line that is used to call the program.  This is
+     * fine in cases where the program is a .exe program, but in the cases where the
+     * program is a called via a script, such as PyGObject's gtk-demo.py, which is normally
+     * called using 'python gtk-demo.py' on Windows, the program name (argv[0])
+     * returned by g_win32_get_command_line() will not be the argv[0] that ->local_command_line()
+     * would expect, causing the program to fail with "This application can not open files."
+     */
+    new_argc = g_strv_length (arguments);
+
+    if (new_argc > argc)
+      {
+        gint i;
+
+        for (i = 0; i < new_argc - argc; i++)
+          g_free (arguments[i]);
+
+        memmove (&arguments[0],
+                 &arguments[new_argc - argc],
+                 sizeof (arguments[0]) * (argc + 1));
+      }
+  }
 #else
   {
     gint i;