pass a parent widget to GHNS dialogs
pass a parent widget to GHNS dialogs

* prevents dialogs to show up separately in the task bar
(cherry picked from commit 5ef55a32607a9a4c0aa2010b479b1f4f85236730)

adraghici/marble,quannt24/marble,AndreiDuma/marble,Earthwings/marble,tucnak/marble,quannt24/marble,AndreiDuma/marble,tzapzoor/marble,tzapzoor/marble,probonopd/marble,David-Gil/marble-dev,utkuaydin/marble,tucnak/marble,utkuaydin/marble,David-Gil/marble-dev,Earthwings/marble,AndreiDuma/marble,tucnak/marble,tzapzoor/marble,Earthwings/marble,David-Gil/marble-dev,adraghici/marble,rku/marble,probonopd/marble,probonopd/marble,quannt24/marble,tzapzoor/marble,quannt24/marble,probonopd/marble,tucnak/marble,tucnak/marble,quannt24/marble,tzapzoor/marble,rku/marble,oberluz/marble,rku/marble,utkuaydin/marble,tucnak/marble,Earthwings/marble,oberluz/marble,rku/marble,adraghici/marble,quannt24/marble,AndreiDuma/marble,AndreiDuma/marble,Earthwings/marble,utkuaydin/marble,AndreiDuma/marble,David-Gil/marble-dev,probonopd/marble,tzapzoor/marble,Earthwings/marble,rku/marble,tzapzoor/marble,oberluz/marble,tucnak/marble,oberluz/marble,David-Gil/marble-dev,tzapzoor/marble,utkuaydin/marble,adraghici/marble,oberluz/marble,utkuaydin/marble,oberluz/marble,rku/marble,adraghici/marble,quannt24/marble,probonopd/marble,David-Gil/marble-dev,adraghici/marble,probonopd/marble