Under gtk3 the height of _"Environment"_ text field in the _"Setup Program"_ dialog is too small. This is how it looks under gtk3:
![scope-setup-gtk3](https://user-images.githubusercontent.com/9009011/53289675-5493b100-3799-11e...)
And this is how it looks under gtk2:
![scope-setup-gtk2](https://user-images.githubusercontent.com/9009011/53289680-62e1cd00-3799-11e...)
Closed #829 via #830.
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