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PyQt Window On Top (Linux - CentOS)

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Has anyone come across this? I have a qt window which I have parented to the houdini session using

setParent(hou.qt.mainWindow(), QtCore.Qt.Window)

and it does as expected on Windows OS. i.e. it always stays on top of the houdini session whilst the Qt UI is open. On a Linux machine running CentOS 7, the window goes behind the Houdini session if you click elsewhere. I have "Keep floating windows on Top" checked on on both windows and Linux systems. I've also added 


into the code to see if that would work but it doesn't. 

As I said, it works fine on Windows so I guess this is an OS thing. Anyone got any ways around this?

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