flowbox: Avoid a crash in measure()

When the children request a height of zero, the
flowbox measure() function was happily dividing
by that zero, leading to badness.

diff --git a/gtk/gtkflowbox.c b/gtk/gtkflowbox.c
index 26b78e3fa38525de6eb0653c0c435ca4acc27945..5c022d45cd6f44913d36b32bbe040fa9213ae916 100644 (file)
--- a/gtk/gtkflowbox.c
+++ b/gtk/gtkflowbox.c
@@ -2075,6 +2075,8 @@ gtk_flow_box_measure (GtkWidget      *widget,
                 goto out_width;
 
               get_max_item_size (box, GTK_ORIENTATION_VERTICAL, &min_item_height, &nat_item_height);
+              if (nat_item_height <= 0)
+                goto out_width;
 
               /* By default flow at the natural item width */
               line_length = avail_size / (nat_item_height + priv->row_spacing);