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The procedure set-menu-spacing! sets the spacing information
for the menu. The parameter description controls the number of
spaces between an item name and an item description. It must not be
larger than TABSIZE. The menu system puts in the middle of
this spacing area the pad character. The remaining parts are filled
with spaces. The parameter rows controls the number of rows
that are used for an item. It must not be larger than 3. The menu
system inserts the blank lines between item rows, these lines will
contain the pad character in the appropriate positions. The parameter
cols controls the number of blanks between columns of items. It
must not be larger than TABSIZE. A value of 0 for all the
spacing values resets them to the default, which is 1 for all of them.
set-menu-spacing! will return E_OK, E_POSTED if
the menu is posted, or E_BAD_ARGUMENT if one of the spacing
values is out of range.
The procedure menu-spacing returns the spacing info for the
menu as a list of three elements: description, row, and column spacing