spinner: Don't inherit from drawing area
spinner: Don't inherit from drawing area

A drawing area is not meant to be subclassed from. It also doesn't
provide any feature a spinner would need either.

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