Parenting to host window merges it with other widgets

[mottosso]

Initially reported by @linez69, a series of flags causes the GUI to merge rather than appear on-top as it's own self-contained window.

To reproduce

In Maya.

from PySide import QtGui

import pyblish.api
import pyblish_lite

pyblish.api.register_host("maya")

parent = {o.objectName(): o for o in QtGui.qApp.topLevelWidgets()}["MayaWindow"]
window = pyblish_lite.show(parent)

Problem

        self.setWindowFlags(QtCore.Qt.WindowTitleHint |
                            QtCore.Qt.WindowMaximizeButtonHint |
                            QtCore.Qt.WindowMinimizeButtonHint |
                            QtCore.Qt.WindowCloseButtonHint)

• Reference

Solution

Include existing window flags.

        self.setWindowFlags(self.windowFlags() |
                            QtCore.Qt.WindowTitleHint |
                            QtCore.Qt.WindowMaximizeButtonHint |
                            QtCore.Qt.WindowMinimizeButtonHint |
                            QtCore.Qt.WindowCloseButtonHint)