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a11y: Fix ref counting in tree views

Matthias Clasen requested to merge gtk3-a11y-leak into gtk-3-24

GtkContainerCellAccessible wasn't unsetting accessible parents. Fix that.

By itself, this doesn't help for freeing a memory leak, since AtkObject keeps a ref on its parent, so we never free the GtkContainerCellAccessible as long as it has children.

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