SYNTAX            : RANGE ;A

RESULTING ARGUMENT: None

FUNCTION          : Convert multiple spaces to TABs to compress a text
                    without changing the layout. The size of a TAB is
                    taken from the corresponding CTRL_X-setting.

                    The counterpart for ;A is ;B.

RANGE             : START,END
                    START         : the buffer position to start at
                    END           : the buffer position to stop at

NOTE              : The first line is only converted if the starting point
                    is at the beginning of the line.
                    The last line is only converted if the ending point
                    is at the beginning of the next line.

MATRIX