csd: Ignore titlebars when hidden
csd: Ignore titlebars when hidden

We were not drawing the content background in the titlebar
area when fullscreen, and were still treating clicks there
as if they were on the titlebar.

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