* Gui: Fix value field for DlgAddPropertyVarSet
The value field would only appear if a name was provided resulting in a
strange user experience. This commit fixes this and simplifies the
logic of the dialog.
* Process comments from review
Co-authored-by: Kacper Donat <kadet1090@gmail.com>
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Co-authored-by: Kacper Donat <kadet1090@gmail.com>
Qt automatically selects the text in the value field on creation. This
interferes with the selection when the field has focus. This commit
ensures that the automatic selection is undone.