Fix crashes on apps that use tray icons by adding them to the save-set
Fix crashes on apps that use tray icons by adding them to the save-set

Quoting awesome git commit 775ea16e by Uli Schlachter:

 When an X11 client disconnects from the X server, all of its windows are
 destroyed. This also means that all the sub-windows of those windows are
 destroyed which is not necessary what one wants to happen.

 To work around this, X11 has a "save-set". All the windows that are in the
 save-set are reparented to their closest ancestor when they would normally be
 destroyed. This is just what this code needs. :)

kopchik/qtile,frostidaho/qtile,rxcomm/qtile,ramnes/qtile,farebord/qtile,tych0/qtile,himaaaatti/qtile,himaaaatti/qtile,jdowner/qtile,flacjacket/qtile,ramnes/qtile,kseistrup/qtile,apinsard/qtile,encukou/qtile,zordsdavini/qtile,de-vri-es/qtile,zordsdavini/qtile,de-vri-es/qtile,nxnfufunezn/qtile,flacjacket/qtile,aniruddhkanojia/qtile,frostidaho/qtile,encukou/qtile,qtile/qtile,aniruddhkanojia/qtile,kynikos/qtile,jdowner/qtile,andrewyoung1991/qtile,xplv/qtile,kiniou/qtile,farebord/qtile,kynikos/qtile,soulchainer/qtile,EndPointCorp/qtile,kiniou/qtile,EndPointCorp/qtile,qtile/qtile,cortesi/qtile,soulchainer/qtile,kseistrup/qtile,apinsard/qtile,w1ndy/qtile,cortesi/qtile,xplv/qtile,tych0/qtile,StephenBarnes/qtile,dequis/qtile,w1ndy/qtile,dequis/qtile,kopchik/qtile,StephenBarnes/qtile,rxcomm/qtile,nxnfufunezn/qtile,andrewyoung1991/qtile