Fix updating selection in wxNotebook::InsertPage() in wxQt

Just use DoSetSelectionAfterInsertion() provided by the base class,
which does the right thing already, including both setting m_selection
and sending (or not sending) the corresponding events.

src/qt/notebook.cpp

@@ -154,12 +154,8 @@ bool wxNotebook::InsertPage(size_t n, wxWindow *page, const wxString& text,
 
     // reenable firing qt signals as internal wx initialization was completed
     m_qtTabWidget->blockSignals(false);
-    m_selection = m_qtTabWidget->currentIndex();
 
-    if (bSelect && GetPageCount() > 1)
-    {
-        SetSelection( n );
-    }
+    DoSetSelectionAfterInsertion(n, bSelect);
 
     return true;
 }