Remove ghost window #716
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Remove ghost window #716
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The ghost window appeared because `setVisible(True)` was called on a widget (`cancel` in this case) whose only parent was a layout (`cbox`). This forced the button (and layout) to be displayed as/in a new window. This window gets destroyed as soon as the layout gets a "proper" parent which is not visible. This happens only a few lines after when `vbox` is set as layout for the ProgressWin QDialog. To solve this, do not set the button to explicitly visible but only hide it if it shouldn't be displayed. I am not going to question why the button is only hidden instead of completely removed, I will just accept it as given right now.
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See my comment in #648 for a full explanation.
Fixes #648.