commit 1b2e9124f0bd7fde11e2b6faad6e75c38da1abe1
Author: Tristan Van Berkom <tristan.van.berkom@gmail.com>
Date:   Tue Jun 15 14:27:12 2010 -0400

    Fixed negative allocations from gtk_box_size_allocate()
    
    Fixed the allocation loop to check if it was allocated at least
    enough space to hold its visible children before going and distributing
    extra space among children. Fixes bgo #617444.

diff --git a/gtk/gtkbox.c b/gtk/gtkbox.c
index f16b7c4..c506fed 100644
--- a/gtk/gtkbox.c
+++ b/gtk/gtkbox.c
@@ -517,7 +517,6 @@ gtk_box_size_allocate (GtkWidget     *widget,
            */
 
           /* Sort descending by gap and position. */
-
           g_qsort_with_data (spreading,
                              nvis_children, sizeof (GtkBoxSpreading),
                              gtk_box_compare_gap, sizes);
@@ -525,7 +524,7 @@ gtk_box_size_allocate (GtkWidget     *widget,
           /* Distribute available space.
            * This master piece of a loop was conceived by Behdad Esfahbod.
            */
-          for (i = nvis_children - 1; i >= 0; --i)
+          for (i = nvis_children - 1; size > 0 && i >= 0; --i)
             {
               /* Divide remaining space by number of remaining children.
                * Sort order and reducing remaining space by assigned space
@@ -1061,7 +1060,7 @@ gtk_box_compute_size_for_opposing_orientation (GtkBox *box,
           /* Distribute available space.
            * This master piece of a loop was conceived by Behdad Esfahbod.
            */
-          for (i = nvis_children - 1; i >= 0; --i)
+          for (i = nvis_children - 1; size > 0 && i >= 0; --i)
             {
               /* Divide remaining space by number of remaining children.
                * Sort order and reducing remaining space by assigned space
