Don't use hidden items for size calc (patch 1698314)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45406 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/gbsizer.cpp

@@ -537,6 +537,9 @@ void wxGridBagSizer::RecalcSizes()
     {
         int row, col, endrow, endcol;
         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
+
+        if ( item->IsShown() )
+        {
             item->GetPos(row, col);
             item->GetEndPos(endrow, endcol);
 
@@ -551,6 +554,7 @@ void wxGridBagSizer::RecalcSizes()
             width += (endcol - col) * m_hgap; // add a hgap for every col spanned
 
             SetItemBounds(item, colpos[col], rowpos[row], width, height);
+        }
 
         node = node->GetNext();
     }