This control function inserts one or more space (SP) characters starting at the cursor position.
Available in: VT Level 4 mode only
is the number of characters to insert.
Default: Pn = 1.
The ICH sequence inserts Pn blank characters with the normal character attribute. The cursor remains at the beginning of the blank characters. Text between the cursor and right margin moves to the right. Characters scrolled past the right margin are lost. ICH has no effect outside the scrolling margins.