This involves moving
the lines in the window data structure.
As an optimization, if the scrolling
region of the window is the entire screen,
the \fIphysical screen\fP may be scrolled at the same time.
.PP
This involves moving
the lines in the window data structure.
As an optimization, if the scrolling
region of the window is the entire screen,
the \fIphysical screen\fP may be scrolled at the same time.
.PP