install_dialog: Make use of [[nodiscard]] where applicable
Allows the compiler to warn against cases where the return value isn't used (which would be a bug).
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				| @ -20,8 +20,8 @@ public: | ||||
|     explicit InstallDialog(QWidget* parent, const QStringList& files); | ||||
|     ~InstallDialog() override; | ||||
| 
 | ||||
|     QStringList GetFiles() const; | ||||
|     int GetMinimumWidth() const; | ||||
|     [[nodiscard]] QStringList GetFiles() const; | ||||
|     [[nodiscard]] int GetMinimumWidth() const; | ||||
| 
 | ||||
| private: | ||||
|     QListWidget* file_list; | ||||
|  | ||||
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