[gtk/fix-imcontext-crash] imcontextsimple: Fix a crash

[Matthias Clasen <matthiasc src gnome org>]

commit 6f9e8ce165b70f2620a6f2a2767e0a467484272e
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Feb 9 17:58:58 2021 -0500

    imcontextsimple: Fix a crash
    
    In the backport, I inadvertendly removed the
    set_client_window implementation, which needs
    to remain.

 gtk/gtkimcontextsimple.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
---
diff --git a/gtk/gtkimcontextsimple.c b/gtk/gtkimcontextsimple.c
index e73f39215e..f6dbe98cbd 100644
--- a/gtk/gtkimcontextsimple.c
+++ b/gtk/gtkimcontextsimple.c
@@ -19,6 +19,16 @@
 
 #include <gdk/gdk.h>
 
+#ifdef GDK_WINDOWING_X11
+#include <gdk/gdkx.h>
+#endif
+#ifdef GDK_WINDOWING_WAYLAND
+#include <wayland/gdkwayland.h>
+#endif
+#ifdef GDK_WINDOWING_WIN32
+#include <win32/gdkwin32.h>
+#endif
+
 #include <stdlib.h>
 #include <string.h>
 
@@ -110,6 +120,9 @@ static void     gtk_im_context_simple_get_preedit_string (GtkIMContext
                                                          char                    **str,
                                                          PangoAttrList           **attrs,
                                                          int                      *cursor_pos);
+static void     gtk_im_context_simple_set_client_window  (GtkIMContext             *context,
+                                                          GdkWindow                *window);
+
 
 static void init_compose_table_async (GCancellable         *cancellable,
                                       GAsyncReadyCallback   callback,
@@ -126,6 +139,7 @@ gtk_im_context_simple_class_init (GtkIMContextSimpleClass *class)
   im_context_class->filter_keypress = gtk_im_context_simple_filter_keypress;
   im_context_class->reset = gtk_im_context_simple_reset;
   im_context_class->get_preedit_string = gtk_im_context_simple_get_preedit_string;
+  im_context_class->set_client_window = gtk_im_context_simple_set_client_window;
   gobject_class->finalize = gtk_im_context_simple_finalize;
 
   init_compose_table_async (NULL, NULL, NULL);
@@ -927,6 +941,12 @@ gtk_im_context_simple_get_preedit_string (GtkIMContext   *context,
     *str = g_string_free (s, FALSE);
 }
 
+static void
+gtk_im_context_simple_set_client_window  (GtkIMContext *context,
+                                          GdkWindow    *window)
+{
+}
+
 /**
  * gtk_im_context_simple_add_table: (skip)
  * @context_simple: A #GtkIMContextSimple