treeview: theme the dnd frame of GtkTreeview
treeview: theme the dnd frame of GtkTreeview

Now that GTK supports it.

cosimoc/gnome-themes-standard,cosimoc/gnome-themes-standard,magcius/gnome-themes-standard,cosimoc/gnome-themes-standard,ChrisCummins/gnome-themes-standard,rgcjonas/adwaita-semidark,ChrisCummins/gnome-themes-standard,ChrisCummins/gnome-themes-standard,ChrisCummins/gnome-themes-standard,Distrotech/gnome-themes-standard,Distrotech/gnome-themes-standard,rgcjonas/adwaita-semidark,rgcjonas/adwaita-semidark,DoctorJellyface/gnome-themes-standard,ChrisCummins/gnome-themes-standard,magcius/gnome-themes-standard,magcius/gnome-themes-standard,cosimoc/gnome-themes-standard,DoctorJellyface/gnome-themes-standard,rgcjonas/adwaita-semidark