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Usually, educated GtkContainers' forall() implementation returns children in an order that's safe for the default draw() implementation in GtkContainer. So for widgets with some stacking notions (eg. GtkOverlay), _gtk_widget_find_at_coords() needs to recurse within containers in reverse order so it finds the topmost widget. As this function is used in both tooltips and DnD code, this improves behavior of "floating" widgets wrt those two. This could for example be seen in the "Transparent" GTK+ demo, where dropping text on the entry results on the text going to the textview. https://bugzilla.gnome.org/show_bug.cgi?id=699239
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