update element and arg ptr

xj qian

2024-06-26 fbbba3f63db427c14e342afa6ba6e3db90b28e78

 jrj/xframe/src/xstring.cpp

@@ -284,8 +284,13 @@
xstring& xstring::operator =(const xstring& rhs) 
{
    if (data)((KStringBlock<wchar_t>*)data)->Release();
    ((KStringBlock<wchar_t>*)rhs.data)->AddRef();
    data = rhs.data;
    if (rhs.data)
    {
        ((KStringBlock<wchar_t>*)rhs.data)->AddRef();
        data = rhs.data;
    }
    else
        data = nullptr;
   return *this;
}
xstring& xstring::operator =(const wchar_t* rhs)