Making an empty TreeView sub-column not take up any space

[ERDI Gergo <cactus cactus rulez org>]

[Please CC replies to cactus cactus rulez org]

Hi,

I'd like to create a pixbuf sub-column inside a GtkTreeView column that 
doesn't take up any space when the pixbuf is empty. Currently I'm setting 
up the view like this:

    column = gtk_tree_view_column_new ();

    renderer = gtk_cell_renderer_pixbuf_new ();
    gtk_tree_view_column_pack_start (column, renderer, false);
    gtk_tree_view_column_add_attribute (column, renderer, "pixbuf", COLUMN_ICON);

    renderer = gtk_cell_renderer_text_new ();
    gtk_tree_view_column_pack_start (column, renderer, true);
    gtk_tree_view_column_add_attribute (column, renderer, "text", COLUMN_LABEL);

    gtk_tree_view_append_column (treeview, column);

However, as you can see in this screenshot:
	http://cactus.rulez.org/files/treeview-align.png
the same width is allocated for empty pixbufs.

How can I avoid that?

Thanks,
	Gergo

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