Fixed GtkMenuItem to reserve the actual arrow size and spacing
Fixed GtkMenuItem to reserve the actual arrow size and spacing

GtkMenuItem was reserving arrow size based on it's requested height,
now base the submenu arrow size on the actual arrow size and spacing.

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