[nautilus] list-view: fix opening background menu by keyboard

[Ernestas Kulik <ernestask src gnome org>]

commit d75c0f9c9ac849ca59ccdefe7a2e58cd3f60a6f9
Author: djb <db0451 gmail com>
Date:   Tue Oct 18 11:50:15 2016 +0100

    list-view: fix opening background menu by keyboard
    
    This was broken by commit 1f57c5b19c099ae44b2c8ec8ca9a1904f1ed7885.
    When the keyboard was used to pop up this menu, a zero-initialised
    GdkEventButton was passed to gtk_menu_popup_at_pointer, which led to
    this warning:
    
    Gtk-CRITICAL **: gtk_menu_popup_at_rect: assertion 'GDK_IS_WINDOW
    (rect_window)' failed"
    
    As suggested by Ernestas Kulik, we can fix this by passing a NULL event
    pointer instead, which leads to the GtkMenu function falling back to the
    current cursor position anyway, and the menu opens OK at that location.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773148

 src/nautilus-list-view.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/nautilus-list-view.c b/src/nautilus-list-view.c
index d525282..fbc50d7 100644
--- a/src/nautilus-list-view.c
+++ b/src/nautilus-list-view.c
@@ -922,7 +922,6 @@ key_press_callback (GtkWidget   *widget,
                     gpointer     callback_data)
 {
     NautilusFilesView *view;
-    GdkEventButton button_event = { 0 };
     gboolean handled;
     GtkTreeView *tree_view;
     GtkTreePath *path;
@@ -941,7 +940,7 @@ key_press_callback (GtkWidget   *widget,
         {
             if (event->state & GDK_CONTROL_MASK)
             {
-                nautilus_files_view_pop_up_background_context_menu (view, &button_event);
+                nautilus_files_view_pop_up_background_context_menu (view, NULL);
                 handled = TRUE;
             }
         }