Notes on terminal emulation, scroll region vs. Insert and delete line

[Info-Mac]

Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 UW 5/3/83; site uw-beaver
Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!houxm!vax135!cornell!uw-beaver!info-mac
From: info-mac@uw-beaver (info-mac)
Newsgroups: fa.info-mac
Subject: Notes on terminal emulation, scroll region vs. Insert and delete line
Message-ID:
Date: Sat, 1-Sep-84 15:23:58 EDT
Article-I.D.: uw-beaver>.1617
Posted: Sat Sep 1 15:23:58 1984
Date-Received: Mon, 3-Sep-84 09:43:50 EDT
Sender: daemon@uw-beave
Organization: U of Washington Computer Science
Lines: 9

From: Tim McNerney
Two flaws in your analysis: (1) You are completely ignoring padding,
which makes the character by character comparison invalid, and (2) for
editors like Emacs, scroll region is much more desirable because it
does not affect the mode line at the bottom of the screen, whereas
insert and delete line commands "jiggle" the mode line. Furthermore,
editors often simulate scroll region by doing a move cursor, delete
line, move cursor, insert line, so scroll region is an optimization.