Remove whitespace when qtableview is smaller than its containing widget

[genedan]

Example, see the whitespace below and to the right of the table:

The following can be used to solve this problem:

https://stackoverflow.com/questions/49773685/qtablewidget-remove-black-space-pyqt5

We would need to add an extra column to the right, and an extra row to the bottom, and apply the .setStretchLastSection method accordingly.