menuitem: share code between HFW and non-HFW height requests
menuitem: share code between HFW and non-HFW height requests

The code is very similar; having two slightly different code paths is
bad and can lead to bugs. Refactor the code to use the same height
request function.

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