Fixed GtkNotebook to not consult GtkWidget->requisition directly
Fixed GtkNotebook to not consult GtkWidget->requisition directly

GtkNotebook was filling widget->requisition directly at "size-request"
time instead of filling in the *requsition argument, also (more importantly)
at size_allocate time GtkNotebook was consulting the action widget's
widget->requisition directly instead of safely calling
gtk_widget_get_child_requisition(). This commit closes bgo #628068.

Sidnioulz/SandboxGtk,Sidnioulz/SandboxGtk,Distrotech/gtk2,simokivimaki/gtk,chergert/gtk,jigpu/gtk,grubersjoe/adwaita,Lyude/gtk-,davidt/gtk,grubersjoe/adwaita,jessevdk/gtk,simokivimaki/gtk,jadahl/gtk,ahodesuka/gtk,ahodesuka/gtk,grubersjoe/adwaita,davidgumberg/gtk,chergert/gtk,Adamovskiy/gtk,bratsche/gtk-,chergert/gtk,Distrotech/gtk2,grubersjoe/adwaita,jadahl/gtk,Adamovskiy/gtk,alexlarsson/gtk,alexlarsson/gtk,alexlarsson/gtk,davidt/gtk,ebassi/gtk,alexlarsson/gtk,davidt/gtk,davidgumberg/gtk,Sidnioulz/SandboxGtk,bratsche/gtk-,alexlarsson/gtk,Lyude/gtk-,jessevdk/gtk,bratsche/gtk-,davidt/gtk,davidgumberg/gtk,msteinert/gtk,Adamovskiy/gtk,jigpu/gtk,davidgumberg/gtk,Lyude/gtk-,msteinert/gtk,simokivimaki/gtk,Adamovskiy/gtk,Sidnioulz/SandboxGtk,ebassi/gtk,msteinert/gtk,ahodesuka/gtk,jadahl/gtk,Distrotech/gtk2,jigpu/gtk,Lyude/gtk-,Distrotech/gtk2,jigpu/gtk,davidgumberg/gtk,msteinert/gtk,Lyude/gtk-,msteinert/gtk,jadahl/gtk,chergert/gtk,grubersjoe/adwaita,ebassi/gtk,davidgumberg/gtk,alexlarsson/gtk,chergert/gtk,bratsche/gtk-,ahodesuka/gtk,Adamovskiy/gtk,jadahl/gtk,Distrotech/gtk2,ahodesuka/gtk,ebassi/gtk,chergert/gtk,davidt/gtk,jessevdk/gtk,davidgumberg/gtk,chergert/gtk,Sidnioulz/SandboxGtk,Distrotech/gtk2,Lyude/gtk-,jigpu/gtk,ahodesuka/gtk,msteinert/gtk,jadahl/gtk,grubersjoe/adwaita,jessevdk/gtk,ebassi/gtk,Sidnioulz/SandboxGtk,Adamovskiy/gtk,Adamovskiy/gtk,jadahl/gtk,jigpu/gtk,chergert/gtk,jadahl/gtk,jigpu/gtk,jessevdk/gtk,simokivimaki/gtk,Lyude/gtk-,alexlarsson/gtk,simokivimaki/gtk,alexlarsson/gtk,davidt/gtk,ahodesuka/gtk,bratsche/gtk-,jigpu/gtk,simokivimaki/gtk,grubersjoe/adwaita,Adamovskiy/gtk,grubersjoe/adwaita,bratsche/gtk-,jessevdk/gtk,ahodesuka/gtk,davidgumberg/gtk,ebassi/gtk,Lyude/gtk-,jessevdk/gtk