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bug#7117: 23.2.2 mangles terminal escape sequences

From: Ryan Johnson
Subject: bug#7117: 23.2.2 mangles terminal escape sequences
Date: Thu, 30 Sep 2010 18:11:58 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100802 Lightning/1.0b2 Thunderbird/3.1.2

 On 9/30/2010 5:44 PM, Eli Zaretskii wrote:
Date: Thu, 30 Sep 2010 17:14:16 +0200
From: Ryan Johnson<address@hidden>
CC: address@hidden, address@hidden

   From the above, it seems that scrolling past beginning or end of buffer
triggers an error, which I guess is somewhat justifiable.
Indeed.  Perhaps we need some infrastructure to ignore errors in this
case (I assume `ignore-errors' won't help).  Or maybe we should allow
not to discard input when we signal an error.  Or maybe discard-input
should be smarter, and not discard partial escape sequences?
One thing I don't get is, I've been using emacs over painfully slow ssh
connections for literally years -- sometimes slow enough that keystrokes
take visible time to echo. This was never really an issue before.
What would you expect to see, that would cause you think it was "an
issue"?  When Emacs is keyboard-driven, typing text and scrolling
commands seldom happen in such a quick succession that hitting end of
buffer while scrolling would discard text you typed meanwhile.  And
even if it did, how would you know for sure you actually typed it?
It's not just keyboard driven. It's a mouse-enabled terminal and the mouse click/wheel actions cause the issues (each one generates a burst of 6-12 characters). As you say, I don't think I've ever seen this happen with keyboard input; pasting commands from a remote X clipboard might have a similar effect, but I've never tried.

In the past, scrolling once or twice past buffer begin/end wasn't guaranteed to dump garbage. It would just beep/flash most of the time, and the slow network connection didn't seem to make it worse. Now, if I'm not on intranet, virtually every scroll past-end will dump garbage somewhere.

Also, the problem I hit this morning was not related to fast typing/clicking over a slow connection. I was doing an ediff-files session, and about every other time I clicked on a buffer to edit a conflict, emacs would reward me with a mangled escape code... sometimes where point had been and sometimes where it ended up. I wasn't typing fast or clicking madly -- it was more like "a n n n n b n n <stare a while> <click> <grumble> <clean up mess>"

The latter problem went away once I got to work and had a fast network; and the former happens much less frequently here (unless I give the wheel a really good spin, but that's understandable).


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