Create the icon pixmap with the system visual
Create the icon pixmap with the system visual

Since what we are doing is turning an icon with alpha into a
no-alpha icon + mask for legacy window managers, it makes more sense
to use the system visual than the window's visual, which might
be ARGB.

https://bugzilla.gnome.org/show_bug.cgi?id=634821

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