GtkSocket: Add error trap around call to XFixesChangeSaveSet()
GtkSocket: Add error trap around call to XFixesChangeSaveSet()

Previously any X error from XFixesChangeSaveSet() was being eaten
by the subsequent error trap when sending a client message. With
asynchronous error traps, that side effect no longer occurs, so
we need to add a proper error trap around the call to
XFixesChangeSaveSet().

https://bugzilla.gnome.org/show_bug.cgi?id=633274

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