ID 312983 - Nuke11 CameraTracker doesn't kill progress panels on Linux

Problem summary
Nuke opens a progress window to display how far it has tracked through a scene when using a CameraTracker node.

When using the CameraTracker node in Nuke11.0v2 however, every time you cancel the track and restart it, Nuke will spawn more & more blank windows.

It appears to be a QT window error where exited windows are not successfully killed, thus causing the display to fill up with empty windows.

Customer reported version
nuke.11.0v2

Customer reported platform
centos7

Steps to reproduce

LINUX ONLY

1) Open Nuke11

2) Import some footage and create a 'CameraTracker' node.

3) In the CameraTracker node, track the shot.

4) Cancel the track and re-track it.

Result: Two windows will appear, Keep repeating step 4 for many windows such as the example below:

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Reproduced by support

Nuke11.0v2 - CentOS6.9/7
Nuke11.0v1 - CentOS6.9/7

Regression

Nuke10.5v6 - CentOS6.9/7
Nuke10.0v6 - CentOS6.9/7


Works correctly on Windows & Mac

Nuke11.0v2 - Windows 7 - Mac10.12
Nuke11.0v1 - Windows 7 - Mac10.12
Nuke10.5v6 - Windows 7 - Mac10.12
Nuke10.0v6 - Windows 7 - Mac10.12

Expected behaviour
The Window should be killed when finishing or cancelling the CameraTracker progress

Actual behaviour
The Window does not get killed and multiplies with every Track/Solve