a11y: Check whether a widget is mapped before querying its parent
a11y: Check whether a widget is mapped before querying its parent

Call gtk_widget_get_mapped() in a couple of places before looking at the
widget's parent, since it might be set to a widget that has been
finalized, causing an invalid read.

ahodesuka/gtk,jadahl/gtk,jessevdk/gtk,jigpu/gtk,grubersjoe/adwaita,msteinert/gtk,chergert/gtk,ebassi/gtk,Adamovskiy/gtk,davidgumberg/gtk,Sidnioulz/SandboxGtk,davidgumberg/gtk,Sidnioulz/SandboxGtk,Lyude/gtk-,grubersjoe/adwaita,ahodesuka/gtk,jadahl/gtk,davidgumberg/gtk,jadahl/gtk,chergert/gtk,Lyude/gtk-,grubersjoe/adwaita,ahodesuka/gtk,Sidnioulz/SandboxGtk,jigpu/gtk,davidgumberg/gtk,chergert/gtk,alexlarsson/gtk,jigpu/gtk,ahodesuka/gtk,jessevdk/gtk,Lyude/gtk-,jigpu/gtk,msteinert/gtk,alexlarsson/gtk,alexlarsson/gtk,msteinert/gtk,jessevdk/gtk,jigpu/gtk,jadahl/gtk,Adamovskiy/gtk,alexlarsson/gtk,Adamovskiy/gtk,jadahl/gtk,davidgumberg/gtk,jessevdk/gtk,jessevdk/gtk,ebassi/gtk,jigpu/gtk,Sidnioulz/SandboxGtk,Lyude/gtk-,jessevdk/gtk,alexlarsson/gtk,Lyude/gtk-,jigpu/gtk,davidgumberg/gtk,grubersjoe/adwaita,msteinert/gtk,chergert/gtk,grubersjoe/adwaita,chergert/gtk,ahodesuka/gtk,grubersjoe/adwaita,ahodesuka/gtk,jigpu/gtk,chergert/gtk,ebassi/gtk,jadahl/gtk,Adamovskiy/gtk,davidgumberg/gtk,Adamovskiy/gtk,chergert/gtk,ebassi/gtk,Lyude/gtk-,ebassi/gtk,Lyude/gtk-,Adamovskiy/gtk,ahodesuka/gtk,Adamovskiy/gtk,jadahl/gtk,ebassi/gtk,Sidnioulz/SandboxGtk,jadahl/gtk,grubersjoe/adwaita,ahodesuka/gtk,Adamovskiy/gtk,Sidnioulz/SandboxGtk,msteinert/gtk,chergert/gtk,jessevdk/gtk,alexlarsson/gtk,msteinert/gtk,davidgumberg/gtk,Lyude/gtk-,alexlarsson/gtk,grubersjoe/adwaita,alexlarsson/gtk