GtkStack children accessibility issues
When a GtkStack widget is switched from one child to another, strange things happen to the accessible hierarchy, including apparition (as reported by accerciser) of 2 a11y nodes for a single child (sometimes allowing to access the widget sometimes not), and disappearance of a11y nodes.
This sometimes leads to accerciser and/or the example crashing with double free or corruption (fasttop)
.
This small GtkStack example is enough to show the problem: launch it together with accerciser, go select the stack in the widget tree, play with the "switch" button and enjoy.