Move the cursor to the next line in the scrolling region, possibly scrolling.
If the cursor is outside of the scrolling region:
If the cursor is inside the scrolling region:
This unsets the pending wrap state without wrapping.
When invoked from auto wrap it does not set the background of the newly added line to thr current SGR state. See https://bugzilla.gnome.org/show_bug.cgi?id=754596 for discussion.