wxDataViewCtrl: fix autosized columns recalculation.

The code and its assumptions were correct only for generic wxHeaderCtrl,
it didn't work for MSW implementation. Fixed by updating all columns
every time.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66729 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/datavgen.cpp

@@ -4325,8 +4325,9 @@ void wxDataViewCtrl::InvalidateColBestWidths()
 
     if ( m_headerArea )
     {
-        // this updates visual appearance of columns 0 and up, not just 0
-        m_headerArea->UpdateColumn(0);
+        const unsigned cols = m_headerArea->GetColumnCount();
+        for ( unsigned i = 0; i < cols; i++ )
+            m_headerArea->UpdateColumn(i);
     }
 }