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Article #87553

emacs 19.26: strange screen (non) update

#87553
From: Tom Horsley
Date: Wed, 14 Sep 1994 14:34
88 lines
3478 bytes
Running emacs 19.26, config m88k-harris-cxux, under the X interface, the
screen fails to show me a newline I just inserted at beginning of window.

To reproduce, start emacs with the -no-init-file option and edit the
following file, then follow the instructions embedded in the file
starting at line 4:
------------------------------cut here------------------------------
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
Position this line at the top of the screen with the cursor at beginning of line
Hit ENTER (bound to the newline function), and the screen doesn't change.
The nice new blank line I just typed is invisible.
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
idsffjljkbnlkdjbnkdfj
dlkfbdkjbkidsffjljkbnlkdjbnkdfj
dlkfbdkjbkdjbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
djbkdfj
387629087769058795
xmn nvmnbmn
ieruhlkfjbh03957y3908tkdlfjbgjh
------------------------------cut here------------------------------
I only just noticed this under 19.26, but I tried 19.25 and even 18.55 and
it exhibits the same behavior. I really expect the empty line I just
produced to be visible at the top of the screen. I think this may be too
much of a good thing as far as optimizing screen updates goes (But
apparently it has always been thus - I can't believe this is the first time
I noticed it :-).

--
Tom.Horsley@mail.csd.harris.com
Home: 511 Kingbird Circle Delray Beach FL  33444
Work: Harris Computers, 2101 W. Cypress Creek Rd. Ft. Lauderdale FL  33309
Take the pledge! No votes for Ollie North supporters! NO POND SCUM!
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From: tom@amber.ssd.csd.harris.com (Tom Horsley)
Newsgroups: gnu.emacs.bug
Subject: emacs 19.26: strange screen (non) update
Date: 14 Sep 1994 10:34:59 -0400
Organization: GNUs Not Usenet
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Reply-To: Tom.Horsley@mail.csd.harris.com