ID 403904 - QFileDialog automatically closes when opened via a context menu

Problem summary
QFileDialog automatically closes when opened via a context menu

This only effects OSX on Nuke 11

Customer reported version

Nuke 11.3v3

Customer reported platform
MacOSX 10.14

Steps to reproduce

1) Open Nuke Studio/Hiero

2) Run the below code:

 import hierofrom PySide2 import QtWidgetsclass Test(QtWidgets.QAction):    def __init__(self):        super(Test, self).__init__('Test', None)        hiero.core.events.registerInterest('kShowContextMenu/kTimeline', self.eventHandler)        self.triggered.connect(self.main)    def eventHandler(self, event):        event.menu.addAction(self)             def main(self):        file_path = QtWidgets.QFileDialog.getOpenFileName(None, 'Load Data', '/tmp/', '*.*')[0]           print 'file path is: ' + str(file_path)Test = Test()

3) Right click the Timeline, the file dialog appears, then instantly disappears 

Expected behaviour
For the file dialog to open correctly

Actual behaviour
It instantly closes

Reproduced by support

This problem has been reproduced on:

Nuke 11.3v5 - MacOSX 10.13

Nuke 11.3v1 - MacOSX 10.13

Nuke 11.2v1 - MacOSX 10.13

Nuke 11.1v1 - MacOSX 10.13

Nuke 11.0v1 - MacOSX 10.13 - regression

Unable to reproduce bug in:
Nuke 11.3v5 - Windows 10 - CentOS 6.9

Nuke 10.5v8 - MacOSX 10.13

Earliest version tested
Nuke 10.5v8 - This issue no longer appears in this version and has regressed