When using the GDI, the height and width of characters can be set independently (using SIZE_IN_PIXELS@ etc.). In contrast,
when using the GDI+, only the height can be transmitted and a specified width is ignored. The result is that the GDI/GDI+
heights will match but the string widths may not (the design decision within ClearWin+ is that to match the heights is
paramount). When it is expedient to use GDI+ for drawing characters and the when it is important to match the string width
rather than the character height, ClearWin+ provides this function (GET_TEXT_HEIGHT@) to provide the adjusted height
of a given string such that its GDI+ width matches its GDI width.