Use onActivate instead of focusInEvent for page focus control.

src/modules/users/UsersPage.cpp

@@ -128,7 +128,7 @@ UsersPage::createJobs( const QString& defaultUserGroup, const QStringList& defau
 
 
 void
-UsersPage::focusInEvent( QFocusEvent* e )
+UsersPage::onActivate()
 {
     ui->textBoxFullName->setFocus();
 }

src/modules/users/UsersPage.h

@@ -42,8 +42,8 @@ public:
 
     QList< Calamares::job_ptr > createJobs( const QString& defaultUserGroup,
                                             const QStringList& defaultGroupsList );
-protected:
+
-    void focusInEvent( QFocusEvent* e ) override;
+    void onActivate();
 
 protected slots:
     void onFullNameTextEdited( const QString& );