ClangTools: Remember selected files

Change-Id: I53227d0ada37b613b7312149bb8e7c15f6bf2bcc
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/clangtools/clangselectablefilesdialog.h

@@ -55,9 +55,12 @@ public:
     FileInfos filteredFileInfos() const;
 
 private:
+    void accept() override;
+
     std::unique_ptr<Ui::SelectableFilesDialog> m_ui;
     std::unique_ptr<SelectableFilesModel> m_filesModel;
 
+    ProjectExplorer::Project *m_project;
     QPushButton *m_analyzeButton = nullptr;
 };