Add explicit

src/widgets/favoritewidget.h

@@ -34,14 +34,14 @@ class FavoriteWidget : public QWidget {
   Q_OBJECT
 
  public:
-  FavoriteWidget(int tab_id, bool favorite = false, QWidget *parent = nullptr);
+  explicit FavoriteWidget(int tab_id, bool favorite = false, QWidget *parent = nullptr);
 
   // Change the value if different from the current one and then update display and emit FavoriteStateChanged signal
   void SetFavorite(bool favorite);
 
   QSize sizeHint() const;
 
-signals:
+ signals:
   void FavoriteStateChanged(int, bool);
 
  protected: