Optimized sizers to not call CalcMin more often than neccessary

Window items added with wxFIXED_MINSIZE flag will set the window's
minsize to its curent size.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28011 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/sizer.h

@@ -74,10 +74,11 @@ public:
 
     wxSize GetMinSize() const
         { return m_minSize; }
+    wxSize GetMinSizeWithBorder() const;
+
     void SetMinSize(const wxSize& size)
         {
-            if (IsWindow() && !(m_flag & wxFIXED_MINSIZE))
-                m_window->SetSizeHints(size);
+            if (IsWindow()) m_window->SetMinSize(size);
             m_minSize = size;            
         }
     void SetMinSize( int x, int y )
@@ -451,6 +452,9 @@ protected:
     int m_flexDirection;
     wxFlexSizerGrowMode m_growMode;
 
+    // saves CalcMin result to optimize RecalcSizes
+    wxSize m_calculatedMinSize;
+
 private:
     DECLARE_CLASS(wxFlexGridSizer)
     DECLARE_NO_COPY_CLASS(wxFlexGridSizer)