[gtk+] Set a style class for drag icons

[Matthias Clasen <matthiasc src gnome org>]

commit c2bdae23a130120eeed7c0a6d29f49af0762ac1b
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Dec 10 21:16:31 2017 -0500

    Set a style class for drag icons
    
    This lets us use the new icon-size machinery to
    ensure we don't have tiny drag icons when using
    named icons.

 gtk/gtkdnd.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkdnd.c b/gtk/gtkdnd.c
index bec5f3b..50ba608 100644
--- a/gtk/gtkdnd.c
+++ b/gtk/gtkdnd.c
@@ -1362,10 +1362,8 @@ set_icon_helper (GdkDragContext     *context,
   GtkWidget *widget;
 
   widget = gtk_image_new ();
-  gtk_widget_show (widget);
-
+  gtk_style_context_add_class (gtk_widget_get_style_context (widget), "drag-icon");
   gtk_image_set_from_definition (GTK_IMAGE (widget), def);
-
   gtk_drag_set_icon_widget_internal (context, widget, hot_x, hot_y, TRUE);
 }