Sets the formatting rectangle for this CRichEditCtrl object.
The formatting rectangle is the limiting rectangle for the text. The limiting rectangle is independent of the size of the rich edit control window. When this CRichEditCtrl object is first created, the formatting rectangle is the same size as the client area of the window. Use SetRect to make the formatting rectangle larger or smaller than the rich edit window.
For more information, see EM_SETRECT in the Windows SDK.