1421a3f9c5
On GTK2 and GTK3 < 3.3.6 there is no GtkAccessibleClass::widget_unset() method, so we can't destroy our accessible object right away. So, to avoid accessing a destroyed widget, we need to check whether the widget still exists in the the ScintillaGTKAccessible destructor. In other methods it's not necessary because the wrapping GObject class makes sure not to forward other when the widget has been destroyed, but we still have to destroy the C++ instance no matter what, so the check has to be on this side. Fixes #1410.
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