bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Aaron Jensen]

emacs -Q

(require 'term)

M-x ansi-term
select: zsh

type at prompt:

export PROMPT='one
two $'

C-x 2

Expect to see the prompt as:

one
two$

Instead, see:

one
one
two$



In GNU Emacs 26.0.91 (build 1, x86_64-apple-darwin17.3.0, NS appkit-1561.20 Version 10.13.2 (Build 17C205))
 of 2018-01-13 built on aaron-mbt.local
Repository revision: 5dd0e5c54d29e81c07798a124295c8c3f016d621
Windowing system distributor 'Apple', version 10.3.1561
Recent messages:
No event to add
Saving file /Users/aaronjensen/.emacs.d/.cache/work.org...
Wrote /Users/aaronjensen/.emacs.d/.cache/work.org
Fetched data overwrote
/Users/aaronjensen/.emacs.d/.cache/work.org
No event to add
evil-line-move: Beginning of buffer [5 times]
Indenting region...done
Saving file /Users/aaronjensen/.dotfiles/hammerspoon/readline_keys.lua...
Wrote /Users/aaronjensen/.dotfiles/hammerspoon/readline_keys.lua

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs-plus/HEAD-5dd0e5c/share/info/emacs
 --prefix=/usr/local/Cellar/emacs-plus/HEAD-5dd0e5c --with-xml2
 --without-dbus --with-gnutls --with-imagemagick --with-modules
 --with-rsvg --with-ns --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS MODULES LCMS2

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lua

Minor modes in effect:
  eros-mode: t
  magit-auto-revert-mode: t
  global-git-gutter+-mode: t
  git-gutter+-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  company-statistics-mode: t
  company-childframe-mode: t
  company-mode: t
  goto-address-prog-mode: t
  bug-reference-prog-mode: t
  auto-highlight-symbol-mode: t
  highlight-numbers-mode: t
  highlight-parentheses-mode: t
  rainbow-delimiters-mode: t
  flycheck-popup-tip-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  recentf-mode: t
  desktop-save-mode: t
  auto-dim-other-buffers-mode: t
  global-wakatime-mode: t
  wakatime-mode: t
  evil-mc-mode: t
  hl-todo-mode: t
  global-spacemacs-whitespace-cleanup-mode: t
  spacemacs-whitespace-cleanup-mode: t
  ws-butler-global-mode: t
  ws-butler-mode: t
  winum-mode: t
  winner-mode: t
  pupo-mode: t
  purpose-mode: t
  volatile-highlights-mode: t
  global-vi-tilde-fringe-mode: t
  vi-tilde-fringe-mode: t
  save-place-mode: t
  savehist-mode: t
  projectile-rails-global-mode: t
  projectile-mode: t
  persp-mode: t
  global-origami-mode: t
  origami-mode: t
  Info-breadcrumbs-in-mode-line-mode: t
  flycheck-pos-tip-mode: t
  global-flycheck-mode: t
  flycheck-mode: t
  flx-ido-mode: t
  eyebrowse-mode: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  global-evil-search-highlight-persist: t
  evil-search-highlight-persist: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  smartparens-mode: t
  evil-lion-mode: t
  evil-escape-mode: t
  eval-sexp-fu-flash-mode: t
  editorconfig-mode: t
  dtrt-indent-mode: t
  global-anzu-mode: t
  anzu-mode: t
  diff-auto-refine-mode: t
  counsel-mode: t
  ivy-mode: t
  delete-selection-mode: t
  clean-aindent-mode: t
  hybrid-mode: t
  which-key-mode: t
  override-global-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  evil-mode: t
  evil-local-mode: t
  spacemacs-leader-override-mode: t
  global-spacemacs-leader-override-mode: t
  global-hl-line-mode: t
  xterm-mouse-mode: t
  global-auto-revert-mode: t
  auto-revert-mode: t
  shell-dirtrack-mode: t
  ido-vertical-mode: t
  global-page-break-lines-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t
  hs-minor-mode: t

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bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Glenn Morris]

Bisected to 165bea78008ec7545698f2e893821b4090f20c79 (Emacs 25.1).

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Aaron Jensen]

Hi Noam,

I saw that you've been doing some term.el work recently. Do you have
an idea what could be causing this?

> emacs -Q
>
> (require 'term)
>
> M-x ansi-term
> select: zsh
>
> type at prompt:
>
> export PROMPT='one
> two $'
>
> C-x 2
>
> Expect to see the prompt as:
>
> one
> two$
>
> Instead, see:
>
> one
> one
> two$


Thanks!

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Wed, 14 Mar 2018 08:59:55 -0700
> Cc: Noam Postavsky <npostavs@gmail.com>
> 
> I saw that you've been doing some term.el work recently. Do you have
> an idea what could be causing this?

See Glenn's message with bisection: as expected, this is due to the
telling the shell to resize its window.

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Aaron Jensen]

On Wed, Mar 14, 2018 at 10:34 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Aaron Jensen <aaronjensen@gmail.com>
>> Date: Wed, 14 Mar 2018 08:59:55 -0700
>> Cc: Noam Postavsky <npostavs@gmail.com>
>>
>> I saw that you've been doing some term.el work recently. Do you have
>> an idea what could be causing this?
>
> See Glenn's message with bisection: as expected, this is due to the
> telling the shell to resize its window.

I don't know if this was directed at Noam or myself, but one
interesting thing is that iTerm also has artifacts when resizing, but
only if resizing to be horizontally smaller. term.el appears to have
artifacts every time any size change is made (horizontal or vertical).

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Wed, 14 Mar 2018 11:08:32 -0700
> Cc: 30544@debbugs.gnu.org, Noam Postavsky <npostavs@gmail.com>
> 
> On Wed, Mar 14, 2018 at 10:34 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> >> From: Aaron Jensen <aaronjensen@gmail.com>
> >> Date: Wed, 14 Mar 2018 08:59:55 -0700
> >> Cc: Noam Postavsky <npostavs@gmail.com>
> >>
> >> I saw that you've been doing some term.el work recently. Do you have
> >> an idea what could be causing this?
> >
> > See Glenn's message with bisection: as expected, this is due to the
> > telling the shell to resize its window.
> 
> I don't know if this was directed at Noam or myself

It was meant to answer your question.

> but one interesting thing is that iTerm also has artifacts when
> resizing, but only if resizing to be horizontally smaller. term.el
> appears to have artifacts every time any size change is made
> (horizontal or vertical).

I think the problem in term.el is because we send the TIOCSWINSZ ioctl
when we shouldn't, see window-adjust-process-window-size-function and
set-process-window-size.  We had similar issues in the past, see
bug#24465.

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Glenn Morris]

(setq window-adjust-process-window-size-function 'ignore)

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Aaron Jensen]

On Wed, Mar 14, 2018 at 11:30 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> I think the problem in term.el is because we send the TIOCSWINSZ ioctl
> when we shouldn't, see window-adjust-process-window-size-function and
> set-process-window-size.  We had similar issues in the past, see
> bug#24465.

Hmm, this is tricky. For my case, I'd only want to send TIOCSWINSZ if
the width changes. However, if someone ran a full screen application
in a term, they'd want it to send that if the height or width changed
I imagine.

I guess my wondering is what is different about term.el vs iTerm.
iTerm has similar artifacts in zsh if the width is adjusted, but not
when the height is adjusted.

AFAICT the only things they do different are they rate limit the
setting and they prevent setting it if the size is already as it
should be.

https://github.com/gnachman/iTerm2/blob/f8a5930b5c47fa6420f423fcb33320029abdcd5b/sources/PTYTask.m#L873

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Noam Postavsky]

Aaron Jensen <aaronjensen@gmail.com> writes:

> I guess my wondering is what is different about term.el vs iTerm.
> iTerm has similar artifacts in zsh if the width is adjusted, but not
> when the height is adjusted.
>
> AFAICT the only things they do different are they rate limit the
> setting and they prevent setting it if the size is already as it
> should be.
>
> https://github.com/gnachman/iTerm2/blob/f8a5930b5c47fa6420f423fcb33320029abdcd5b/sources/PTYTask.m#L873

Odd.  I have urxvt here, and it seems to be able to resize both width
and height without getting any duplicated prompts.  Could it be that zsh
always repaints the prompt on a resize, but term.el (and iTerm for width
adjustments) don't put point where zsh is expecting after a resize?

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Aaron Jensen]

On Wed, Mar 14, 2018 at 4:49 PM, Noam Postavsky <npostavs@gmail.com> wrote:
> Odd.  I have urxvt here, and it seems to be able to resize both width
> and height without getting any duplicated prompts.  Could it be that zsh
> always repaints the prompt on a resize, but term.el (and iTerm for width
> adjustments) don't put point where zsh is expecting after a resize?

Just to be clear, you're seeing that w/ a two line prompt? This is
really only an issue w/ a two line prompt for me.

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Noam Postavsky]

Aaron Jensen <aaronjensen@gmail.com> writes:

> On Wed, Mar 14, 2018 at 4:49 PM, Noam Postavsky <npostavs@gmail.com> wrote:
>> Odd.  I have urxvt here, and it seems to be able to resize both width
>> and height without getting any duplicated prompts.  Could it be that zsh
>> always repaints the prompt on a resize, but term.el (and iTerm for width
>> adjustments) don't put point where zsh is expecting after a resize?
>
> Just to be clear, you're seeing that w/ a two line prompt? This is
> really only an issue w/ a two line prompt for me.

Yes, I did PROMPT=$'one\ntwo' (by the way, I found I had to remove
'prompt adam1' from my .zshrc (the default setup puts it in), otherwise
setting PROMPT has no effect).  I can reproduce the problem in term.el,
but urxvt doesn't have any problems no matter how I resize.

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Aaron Jensen]

On Wed, Mar 14, 2018 at 6:06 PM, Noam Postavsky <npostavs@gmail.com> wrote:
> Yes, I did PROMPT=$'one\ntwo' (by the way, I found I had to remove
> 'prompt adam1' from my .zshrc (the default setup puts it in), otherwise
> setting PROMPT has no effect).  I can reproduce the problem in term.el,
> but urxvt doesn't have any problems no matter how I resize.

Ah, apparently I can only reproduce it in iterm2 if I have an RPROMPT
that does a lineup and linedown to get the RPROMPT on the first
line...

PROMPT=$'one\ntwo'
local _lineup=$'\e[1A'
local _linedown=$'\e[1B'
RPROMPT='%{${_lineup}%}%*%{${_linedown}%}'

I've also noticed that emacs seems to be doing unnecessary resizing
when switching between perspectives using perspective.el. I haven't
yet looked into what is causing that, but I suspect adding a check
similar to what iterm2 has, where we actually see what the process tty
size is and only set it if it has changed may help that.

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Noam Postavsky]

Aaron Jensen <aaronjensen@gmail.com> writes:

> On Wed, Mar 14, 2018 at 6:06 PM, Noam Postavsky <npostavs@gmail.com> wrote:
>> Yes, I did PROMPT=$'one\ntwo' (by the way, I found I had to remove
>> 'prompt adam1' from my .zshrc (the default setup puts it in), otherwise
>> setting PROMPT has no effect).  I can reproduce the problem in term.el,
>> but urxvt doesn't have any problems no matter how I resize.
>
> Ah, apparently I can only reproduce it in iterm2 if I have an RPROMPT
> that does a lineup and linedown to get the RPROMPT on the first
> line...
>
> PROMPT=$'one\ntwo'
> local _lineup=$'\e[1A'
> local _linedown=$'\e[1B'
> RPROMPT='%{${_lineup}%}%*%{${_linedown}%}'

Not sure if I'm missing some zsh context here, but when I do that, I see
literal "lineup" and "linedown" at the right.  If do instead

PROMPT=$'one\ntwo'
RPROMPT=$'%{\e[1A%}%*%{\e[1B%}'

Then I get the current time on right, and still no prompt duplication
when resizing urxvt.

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Aaron Jensen]

On Wed, Mar 14, 2018 at 6:42 PM, Noam Postavsky <npostavs@gmail.com> wrote:
> Not sure if I'm missing some zsh context here, but when I do that, I see
> literal "lineup" and "linedown" at the right.

Odd, not sure.

> If do instead
>
> PROMPT=$'one\ntwo'
> RPROMPT=$'%{\e[1A%}%*%{\e[1B%}'
>
> Then I get the current time on right, and still no prompt duplication
> when resizing urxvt.

Ok, perhaps there's a bug in iterm2's handling as well :) Either way,
seems that it's possible to resize w/o the unnecessary line drawing,
so now we just need to figure out what the problem in term.el is...

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Noam Postavsky]

Noam Postavsky <npostavs@gmail.com> writes:

> Odd.  I have urxvt here, and it seems to be able to resize both width
> and height without getting any duplicated prompts.  Could it be that zsh
> always repaints the prompt on a resize, but term.el (and iTerm for width
> adjustments) don't put point where zsh is expecting after a resize?

Okay, I edebugged term-emulate-terminal, zsh is sending the correct
escape sequences, the problem is that `term-current-row' is set to 0,
which causes \e[A to be a nop instead of moving the cursor up one row as
it should.

M-x debug-watch RET term-current-row RET reveals that the
term-set-scroll-region call sets term-current-row to 0.  This is
correct, because it does also move point to row 0.  However, after the
call is finished, term-reset-size does (goto-char point) to restore the
original point, but it doesn't reset the cached row accordingly.

So the following fixes it (possibly we should be resetting the current
column as well?).

--- i/lisp/term.el
+++ w/lisp/term.el
@@ -1167,4 +1167,5 @@ term-reset-size
       (setq term-current-column nil)
       (term-set-scroll-region 0 height)
+      (setq term-current-row nil)
       (goto-char point))))

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Cc: 30544@debbugs.gnu.org,  Eli Zaretskii <eliz@gnu.org>
> Date: Sun, 01 Apr 2018 22:39:26 -0400
> 
> So the following fixes it

This is simple enough to go to emacs-26, thanks.

> (possibly we should be resetting the current column as well?).

If the column is also unknown there, yes.

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Noam Postavsky]

tags 30544 fixed
close 30544 26.1
quit

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Noam Postavsky <npostavs@gmail.com>
>> Cc: 30544@debbugs.gnu.org,  Eli Zaretskii <eliz@gnu.org>
>> Date: Sun, 01 Apr 2018 22:39:26 -0400
>> 
>> So the following fixes it
>
> This is simple enough to go to emacs-26, thanks.

Pushed [1: a64c11a3aa].

>> (possibly we should be resetting the current column as well?).
>
> If the column is also unknown there, yes.

I saw that term-set-scroll-region sets the other two cached values, so I
reset them as well.

[1: a64c11a3aa]: 2018-04-02 06:57:53 -0400
  Fix term.el rendering following a window resize (Bug#30544)
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=a64c11a3aa49121ceab79a2acc99c829d42417bd

bug#30544: 26.0.91; ansi-term duplicates 2 line zsh prompts any time windows change (maybe other times)

[Aaron Jensen]

On Mon, Apr 2, 2018 at 4:04 AM, Noam Postavsky <npostavs@gmail.com> wrote:
> I saw that term-set-scroll-region sets the other two cached values, so I
> reset them as well.

Thank you!