[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Darko Veberic]

btw this is in ubuntu 20.04

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Title:
  gnome-terminal with screen interprets mouse wheel events as up/down

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[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Darko Veberic]

this is a huge headache for running vim in the gnome-terminal: the mouse
scroll generates a sequence of key up or down strokes that are
indistinguishable from the real keystrokes. having a very sensitive
mouse scroller will inevitably produce unwanted scrolls to wrong place
while, for instance, pasting the x11 buffer with the middle mouse
button.

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Title:
  gnome-terminal with screen interprets mouse wheel events as up/down

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[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Marius Gedminas]

I've been using this in my ~/.screenrc to tell screen not to switch to
the alternate screen, so I can use my scrollback:

  termcapinfo xterm|xterm-256color ti=\E7\E[?47l:te=\E[H\E[2J\E[?47l

This also enables mouse wheel scrolling of the scrollback (as long as
you don't turn on 'mousetrack' in your .screenrc).

** Changed in: gnome-terminal (Ubuntu)
   Status: New => Opinion

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  gnome-terminal with screen interprets mouse wheel events as up/down

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[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Egmont Koblinger]

Yes, it's the replacement for that previous option. It's enabled by
default, \e[?1007l turns it off ("l"ow), \e[?1007h re-enables ("h"igh).

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  gnome-terminal with screen interprets mouse wheel events as up/down

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[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Guram Savinov]

Could you explain how this escape-sequence works? Does it set true value to the 
alternate_screen_scroll flag in libvte?
Does this ecape secuence substitutes option about alternate screen which was in 
gnome-terminal profile settings?

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  gnome-terminal with screen interprets mouse wheel events as up/down

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[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Egmont Koblinger]

Hmmm, it's hard for me to imagine why/how this could happen. Input
parsing should be independent of what's on the screen.

Anyway, I'm sorry I couldn't help with the escape sequence. I'm
personally out of here (I'm not an Ubuntu developer but a gnome-terminal
one; I'm happy to join again if an issue is reproducible with a much
more recent gnome-terminal even after emitting the said escape
sequence).

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  gnome-terminal with screen interprets mouse wheel events as up/down

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[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Guram Savinov]

No, this escape sequence doesn't change anything.
One more clarification: problem appears only when output on the screen fills 
all rows, i.e. when you output at least one screen of rows.

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  gnome-terminal with screen interprets mouse wheel events as up/down

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[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Egmont Koblinger]

gnome-terminal / vte changed its behavior around that time. There was
also quite a bit of confusion caused by a downstream ubuntu patch and
removal also around that time.

I'm not sure what's 14.04's behavior, but in newer Ubuntus (e.g. 16.04)
you can disable alternate screen scrolling with the DECRESET 1007 escape
sequence, that is:

echo -ne '\e[?1007l'

Maybe it already works in 14.04, please try it.

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  gnome-terminal with screen interprets mouse wheel events as up/down

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[Bug 1688528] Re: gnome-terminal with screen interprets mouse wheel events as up/down

[Guram Savinov]

** Description changed:

  Bug is based on my last comments from
  https://bugs.launchpad.net/ubuntu/+source/screen/+bug/106995
  
  Environment:
  Ubuntu 14.04.5 LTS
  gnome-terminal 3.6.2
  libvte 0.34.9
  screen 4.1.0
  
  The problem is:
  1. screen is running from gnome-terminal
  2. mouse wheel scrolling generates up/down events which ends up as bash 
history scrolling instead of gnome-terminal history scrolling
  3. if run cat command, then mouse wheel ends up as esc-keys: 
^[[A^[[A^[[A^[[A^[[B^[[B^[[B^[[B^[[B
  
  Gnome-terminal's option about alternate screen is not working anymore in 
trusty ubuntu release, but it has been working in precise release.
  As I said in bug 106995: gnome-terminal's option about alternatre screen 
doesn't do anything with vte, so it's useless, but if I understand this patch 
in vte right it set alternate screen option true value on initialization 
automatically.
  
  commit 9f8c1b88dcd880c2d9e78c93521ee755560a9275
  Author: Christian Persch 
  Date: Mon Sep 30 23:00:09 2013 +0200
  
+ gnome-terminal calls vte_terminal_reset in terminal-window.c which set
+ alternate screen flag to true, it's strange that it doesn't work.
+ 
  I suspect that problem is in gnome-terminal, because this problem
  doesn't exists in screen run from xterm or rxvt terminal.

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  gnome-terminal with screen interprets mouse wheel events as up/down

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