Replace wxSizer::RecalcSizes() with RepositionChildren()

The new method takes minimal size just computed by RecalcSizes() as its
argument making it unnecessary to store it as a member variable in the derived
classes such as wx{Box,FlexGrid}Sizer.

The old method can still be overridden for compatibility and by the derived
class that don't need minimal size when updating children.

src/common/wrapsizer.cpp

@@ -92,8 +92,8 @@ void wxWrapSizer::ClearRows()
 {
     // all elements of the row sizers are also elements of this one (we
     // directly add pointers to elements of our own m_children list to the row
-    // sizers in RecalcSizes()), so we need to detach them from the row sizer
-    // to avoid double deletion
+    // sizers in RepositionChildren()), so we need to detach them from the row
+    // sizer to avoid double deletion
     wxSizerItemList& rows = m_rows.GetChildren();
     for ( wxSizerItemList::iterator i = rows.begin(),
                                   end = rows.end();
@@ -485,7 +485,7 @@ void wxWrapSizer::FinishRow(size_t n,
     AdjustLastRowItemProp(n, itemLast);
 }
 
-void wxWrapSizer::RecalcSizes()
+void wxWrapSizer::RepositionChildren(const wxSize& WXUNUSED(minSize))
 {
     // First restore any proportions we may have changed and remove the old rows
     ClearRows();