Fix virtual write-only properties
Fix virtual write-only properties

spidermonkdust/vala,spidermonkdust/vala,themiwi/vala,severinh/vala,kamanashisroy/aroop,jessevdk/vala,rvu95/vala,playya/vala,spidermonkdust/vala,frida/vala,tjol/vala-tjol,severinh/vala,flobrosch/vala-fixes,GNOME/vala,tjol/vala-tjol,playya/vala,themiwi/vala,rvu95/vala,GNOME/vala,Distrotech/vala,flobrosch/vala-fixes,xdave/pvala,rvu95/vala,tjol/vala-tjol,themiwi/vala,Distrotech/vala,GNOME/vala,jessevdk/vala,kamanashisroy/aroop,playya/vala,flobrosch/vala-fixes,GNOME/vala,severinh/vala,frida/vala,kamanashisroy/aroop,Distrotech/vala,frida/vala,frida/vala,frida/vala,jessevdk/vala