[gtksourceview] CompletionContainer: add FIXME comment

[Sébastien Wilmet <swilmet src gnome org>]

commit 6587e6969c87b548aa713220d96a1f29364d3b8c
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Jul 7 12:51:56 2013 +0200

    CompletionContainer: add FIXME comment

 gtksourceview/gtksourcecompletioncontainer.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourcecompletioncontainer.c b/gtksourceview/gtksourcecompletioncontainer.c
index 07efb3d..28bfad2 100644
--- a/gtksourceview/gtksourcecompletioncontainer.c
+++ b/gtksourceview/gtksourcecompletioncontainer.c
@@ -155,6 +155,11 @@ _gtk_source_completion_container_get_preferred_width (GtkWidget *widget,
        GtkRequisition nat_size;
        gint width;
 
+       /* FIXME sometimes the returned height (nat_size.height) is 0. Maybe a
+        * bug in GtkTreeView. If there are sizing problems, or if there are
+        * problems with the scrolled window, a workaround would be to compute
+        * the height manually, like it is done in get_preferred_height() below.
+        */
        gtk_widget_get_preferred_size (GTK_WIDGET (container->priv->tree_view),
                                       NULL,
                                       &nat_size);