Created attachment 257813 [details] [review]
Application source code to show the usage of new API .

I provided new feature enhancement in  GtkEntry to resize the icon through API 
( gtk_entry_set_icon_from_pixbuf_at_size(  GtkEntry             *entry,
                                	   GtkEntryIconPosition icon_pos,
                                	   GdkPixbuf            *pixbuf, 
                                            GtkIconSize GTK_ICON_SIZE_VARIABLE ).
This  interface allows application developers to change the icon size to any desired dimension from the application source code .

void
gtk_entry_set_icon_from_pixbuf_at_size (GtkEntry       *entry,
                                	GtkEntryIconPosition icon_pos,
                                	GdkPixbuf       *pixbuf, 
					GtkIconSize     GTK_ICON_SIZE_VARIABLE)			        

{
  GtkEntryPrivate *priv;
  EntryIconInfo *icon_info;
  g_return_if_fail (GTK_IS_ENTRY (entry));
  g_return_if_fail (IS_VALID_ICON_POSITION (icon_pos));

  priv = entry->priv;

  if ((icon_info = priv->icons[icon_pos]) == NULL)
    icon_info = construct_icon_info (GTK_WIDGET (entry), icon_pos);

  g_object_freeze_notify (G_OBJECT (entry));

  if (pixbuf)
    g_object_ref (pixbuf);

  gtk_entry_clear (entry, icon_pos);
 
  if (pixbuf)
    {
  
        _gtk_icon_helper_set_pixbuf (icon_info->icon_helper, pixbuf);
        _gtk_icon_helper_set_icon_size (icon_info->icon_helper,
                                        GTK_ICON_SIZE_VARIABLE );

      if (icon_pos == GTK_ENTRY_ICON_PRIMARY)
        {
          g_object_notify (G_OBJECT (entry), "primary-icon-pixbuf");
          g_object_notify (G_OBJECT (entry), "primary-icon-storage-type");
        }
      else
        {
          g_object_notify (G_OBJECT (entry), "secondary-icon-pixbuf");
          g_object_notify (G_OBJECT (entry), "secondary-icon-storage-type");
        }

      if (gtk_widget_get_mapped (GTK_WIDGET (entry)))
          gdk_window_show_unraised (icon_info->window);

      g_object_unref (pixbuf);
    }
  
  if (gtk_widget_get_visible (GTK_WIDGET (entry)))
    gtk_widget_queue_resize (GTK_WIDGET (entry));

  g_object_thaw_notify (G_OBJECT (entry));
}

 gtk icon size is set by _gtk_icon_helper_set_icon_size .
Earlier this is called as 
_gtk_icon_helper_set_icon_size (icon_info->icon_helper,
                                GTK_ICON_SIZE_MENU);

GTK_ICON_SIZE_MENU is an enum value of icon size 16 x 16 .

In the new API , I replaced GTK_ICON_SIZE_MENU with GTK_ICON_SIZE_VARIABLE in _gtk_icon_helper_set_icon_size function call . 

In application source code we can create new GtkIconSize as below :

GtkIconSize GTK_ICON_SIZE_VARIABLE  =   gtk_icon_size_register ( "gtk-primary"   , 25 , 25 ); 

This GTK_ICON_SIZE_VARIABLE can be passed to new API implemented by me in the below manner :

gtk_entry_set_icon_from_pixbuf_at_size 
         ( GtkEntry * entry,
           GtkEntryIconPosition icon_pos,
           GdkPixbuf            *pixbuf,
           GtkIconSize GTK_ICON_SIZE_VARIABLE )

Please find the application source code as an attachment to show the usage of new API .Attachments include source code , glade file

*** Bug 724522 has been marked as a duplicate of this bug. ***

Comment on attachment 257813 [details] [review]
Application source code to show the usage of new API .

This does not appear to be "Application source code". What are we supposed to do with it?

Anyway, how to implement variable icon sizes is an ongoing discussion that I have seen several times on IRC, and therefore:

 * For GTK+ 3, it's unlikely that the stable/LTS GTK+ 3 will see any change here

 * For GTK+ 4, variable icon sizes is an ongoing discussion that I've seen in IRC
   several times, so it'll probably happen eventually - at which point it will
   need to do something considerably more thorough than simply adding a variable
   size to one of the multiple ways to set an icon on one single widget class.