// 1. adjust cell's width according to the fact that maximal possible width is w.
// (this has sense when working with horizontal lines, tables etc.)
// 2. prepare layout (=fill-in m_PosX, m_PosY (and sometime m_Height) members)
// = place items to fit window, according to the width w
// 1. adjust cell's width according to the fact that maximal possible width is w.
// (this has sense when working with horizontal lines, tables etc.)
// 2. prepare layout (=fill-in m_PosX, m_PosY (and sometime m_Height) members)
// = place items to fit window, according to the width w