* Implemented BestSize cache

* Added calls to InvalidateBestSize where things affecting BestSize
  are modified.  There are probably several other places where this
  still needs to be done...

* Added wxWindowBase::GetBestFittingSize that will merge the BestSize
  into the MinSize, (if any) and return the result.

* SetBestFittingSize will now only set the MinSize to the value that
  was passed to it, without merging in the BestSize


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28010 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/listbox.cpp

@@ -287,6 +287,8 @@ void wxListBox::Delete(int N)
 
 int wxListBox::DoAppend(const wxString& item)
 {
+    InvalidateBestSize();
+
     int index = ListBox_AddString(GetHwnd(), item);
     m_noItems++;
 
@@ -522,6 +524,8 @@ wxListBox::DoInsertItems(const wxArrayString& items, int pos)
     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
                  wxT("invalid index in wxListBox::InsertItems") );
 
+    InvalidateBestSize();
+
     int nItems = items.GetCount();
     for ( int i = 0; i < nItems; i++ )
     {