[dia] tabs: restore close tab icon

[Zander <zbrown src gnome org>]

commit 8a293e5b079023bfc5bb6a266c2c8a2b8e0451b4
Author: Zander Brown <zbrown gnome org>
Date:   Mon Dec 2 17:38:28 2019 +0000

    tabs: restore close tab icon

 app/interface.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/app/interface.c b/app/interface.c
index f4d6bed7..009c703b 100644
--- a/app/interface.c
+++ b/app/interface.c
@@ -668,7 +668,8 @@ use_integrated_ui_for_display_shell(DDisplay *ddisp, char *title)
 
   /* <from GEdit> */
   /* don't allow focus on the close button */
-  close_button = gtk_button_new();
+  close_button = gtk_button_new ();
+  gtk_widget_set_tooltip_text (close_button, _("Close"));
   gtk_button_set_relief (GTK_BUTTON (close_button), GTK_RELIEF_NONE);
   gtk_button_set_focus_on_click (GTK_BUTTON (close_button), FALSE);
 
@@ -678,7 +679,7 @@ use_integrated_ui_for_display_shell(DDisplay *ddisp, char *title)
   gtk_widget_modify_style (close_button, rcstyle);
   g_object_unref (rcstyle),
 
-  image = gtk_image_new_from_stock (_("_Close"), GTK_ICON_SIZE_MENU);
+  image = gtk_image_new_from_icon_name ("window-close-symbolic", GTK_ICON_SIZE_MENU);
 
   gtk_container_add (GTK_CONTAINER(close_button), image);
   g_signal_connect (G_OBJECT (close_button), "clicked",
@@ -1178,7 +1179,7 @@ create_integrated_ui (void)
  * Create toolbox component for distributed user interface
  */
 void
-create_toolbox ()
+create_toolbox (void)
 {
   GtkWidget *window;
   GtkWidget *main_vbox;