[PyQt] Issue with OpenGL widget in MDI area with hidden toolbar

[Thomas Robitaille]

Hi all,

The following example shows what happens if I create a QMainWindow,
add a toolbar and hide it, then add an OpenGL widget to an MDI area:

from PyQt5 import QtWidgets, QtOpenGL

qtapp = QtWidgets.QApplication([''])

viewer = QtOpenGL.QGLWidget()
viewer.resize(600, 600)
viewer.makeCurrent()

main = QtWidgets.QMainWindow()

tbar = QtWidgets.QToolBar()
main.addToolBar(tbar)
tbar.hide()

mdi = QtWidgets.QMdiArea()

main.setCentralWidget(mdi)

sub = QtWidgets.QMdiSubWindow()
sub.setWidget(viewer)
mdi.addSubWindow(sub)
sub.resize(600, 600)

main.show()

qtapp.exec_()

The result is the attached screenshot qt5_screenshot1.png. If I do not
hide the toolbar, I don't get the weird gray overlay rectangle
(qt5_screenshot2.png). Is this a bug, and if so, how do I report it?
Does anyone have any suggested workarounds?

Thanks!
Tom
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