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bug#23819: 25.0.95; display botched badly in xterm window
From: |
Paul Eggert |
Subject: |
bug#23819: 25.0.95; display botched badly in xterm window |
Date: |
Wed, 22 Jun 2016 04:01:34 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 |
This appears to be a relatively recent regression in the emacs-25
branch. It may not be easy to bisect. I first noticed it a few days ago,
and the display glitches are pretty bad.
I just now reproduced the problem by using ssh to log into a Fedora 23
x86-64 system running emacs-25 (commit
dc5e65b5deb2f5b67f6c3a06ae81c6b074bd4b56) from my laptop, which is
running Ubuntu 12.04.5 gnome-terminal in a 37x80 window (TERM=xterm in
the environment). I have seen the problem from recent Ubuntu clients as
well.
I changed to the Emacs source directory and ran the command
src/emacs -nw -Q src/conf_post.h
I then typed:
C-s h a s _
The screen display was messed up at this point; see attached image.
Notice that the minibuffer says "hhs_" (with a highlighted second "h")
instead of the correct ("has_").
The problem is not easily reproducible. Often Emacs works. Sometimes it
does not, and the screen keeps getting more and more corrupted as time
goes on. Symptoms often differ.
I just now tried a similar recipe (without the '_'), and this time Emacs
contained the following text at the start of the (now-modified)
conf_post.h buffer:
1;3201;0chas/* conf_post.h --- configure.ac includes this via AH_BOTTOM
and view-lossage showed the following:
C-s C-s C-s [isearch-forward]
ESC [ > [nil]
1 [self-insert-command]
; [c-electric-semi&comma]
3 [self-insert-command]
2 [self-insert-command]
0 [self-insert-command]
1 [self-insert-command]
; [c-electric-semi&comma]
0 [self-insert-command]
c [self-insert-command]
h [self-insert-command]
a [self-insert-command]
s [self-insert-command]
ESC x [execute-extended-command]
v [self-insert-command]
i [self-insert-command]
e [self-insert-command]
w [self-insert-command]
- [self-insert-command]
l [self-insert-command]
...
My guess is that there is something wrong with the initial handshake
with the terminal, to find out its characteristics; if memory serves
this is something we've fiddled with in emacs-25 reasonably recently.
Emacs-screenshot.png
Description: PNG image
- bug#23819: 25.0.95; display botched badly in xterm window,
Paul Eggert <=