Debian Bug report logs - #652990
screen: Binding a key to a different action sometimes still yields the default binding

version graph

Package: screen; Maintainer for screen is Axel Beckert <abe@debian.org>; Source for screen is src:screen.

Reported by: "Bruce Momjian,,," <bruce@momjian.us>

Date: Thu, 22 Dec 2011 15:39:02 UTC

Severity: normal

Tags: confirmed, upstream

Found in version screen/4.0.3-14

Forwarded to https://savannah.gnu.org/bugs/index.php?35287

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Report forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Thu, 22 Dec 2011 15:39:05 GMT) Full text and rfc822 format available.

Acknowledgement sent to "Bruce Momjian,,," <bruce@momjian.us>:
New Bug report received and forwarded. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Thu, 22 Dec 2011 15:39:05 GMT) Full text and rfc822 format available.

Message #5 received at submit@bugs.debian.org (full text, mbox):

From: "Bruce Momjian,,," <bruce@momjian.us>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: screen: Cannot bind space to a different action
Date: Thu, 22 Dec 2011 09:54:43 -0500
Package: screen
Version: 4.0.3-14
Severity: normal


I can cannot change the binding of the spacebar in screen.  If you start 
screen with just this configuration file:

	bind ' ' info

you will find that when you start screen, ^A-space will show the window 
info, but once you press Enter, ^A-space will do 'next screen' and never
show info again.  This is true even though ^A-? shows space as bound to 
'info':

	info        sp i

I used 'info' as an example, but there is no action that can be properly
bound to space, e.g. 'other'.  This worked in older versions of screen.

-- System Information:
Debian Release: 6.0.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/16 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages screen depends on:
ii  dpkg                      1.15.8.11      Debian package management system
ii  install-info              4.13a.dfsg.1-6 Manage installed documentation in 
ii  libc6                     2.11.2-10      Embedded GNU C Library: Shared lib
ii  libncursesw5              5.7+20100313-5 shared libraries for terminal hand
ii  libpam0g                  1.1.1-6.1      Pluggable Authentication Modules l

screen recommends no packages.

screen suggests no packages.

-- Configuration Files:
/etc/screenrc changed:
deflogin on
vbell on
defscrollback 1024
bind ^k
bind ^\
bind \\ quit
bind K kill
bind I login on
bind O login off
bind } history
termcapinfo vt100 dl=5\E[M
hardstatus off
termcapinfo xterm*|rxvt*|kterm*|Eterm* hs:ts=\E]0;:fs=\007:ds=\E]0;\007
hardstatus string "%h%? users: %u%?"
termcapinfo xterm*|linux*|rxvt*|Eterm* OP
termcapinfo xterm 'is=\E[r\E[m\E[2J\E[H\E[?7h\E[?1;4;6l'
defnonblock 5
escape ^zZ
bind f
bind ^z next
bind ' ' info
bind - prev
bind p screen /letc/hardcopyprint
bind x
bind ^x
bind L reset
hardcopy_append on
vbell_msg " Wuff "
screen -t login 0 /bin/bash
screen -t startup 9 /letc/multi_save


-- no debconf information




Information forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Fri, 23 Dec 2011 14:30:03 GMT) Full text and rfc822 format available.

Acknowledgement sent to Axel Beckert <abe@debian.org>:
Extra info received and forwarded to list. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Fri, 23 Dec 2011 14:30:05 GMT) Full text and rfc822 format available.

Message #10 received at 652990@bugs.debian.org (full text, mbox):

From: Axel Beckert <abe@debian.org>
To: Bruce Momjian <bruce@momjian.us>, 652990@bugs.debian.org
Cc: Debian Bug Tracking System E-Mail Control Server <control@bugs.debian.org>
Subject: Re: Bug#652990: screen: Cannot bind space to a different action
Date: Fri, 23 Dec 2011 15:28:24 +0100
tag 652990 + unreproducible moreinfo
kthxbye

Hi Bruce,

Bruce Momjian,,, wrote:
> Package: screen
> Version: 4.0.3-14
> Severity: normal
> 
> I can cannot change the binding of the spacebar in screen.  If you start 
> screen with just this configuration file:
> 
> 	bind ' ' info
> 
> you will find that when you start screen, ^A-space will show the window 
> info, but once you press Enter, ^A-space will do 'next screen' and never
> show info again.

I'm sorry, but I can't reproduce this problem.

I put "bind ' ' info" as sole line (with line break at the end) in a
.screenrc, started screen, pressed ^A-Space, it worked fine. I then
pressed Enter in the shell as well as ^A-Enter, but ^A-Space as well
as ^A-Enter continue to show the one line window info. Nothing tries
to switch to the next window, i.e. it works fine for me.

I tested it on Squeeze amd64 as you seem to have experienced the
issue on Squeeze amd64.

Maybe there need some additional requirements to be met to run into
this issue?

		Regards, Axel
-- 
 ,''`.  |  Axel Beckert <abe@debian.org>, http://people.debian.org/~abe/
: :' :  |  Debian Developer, ftp.ch.debian.org Admin
`. `'   |  1024D: F067 EA27 26B9 C3FC 1486  202E C09E 1D89 9593 0EDE
  `-    |  4096R: 2517 B724 C5F6 CA99 5329  6E61 2FF9 CD59 6126 16B5




Added tag(s) unreproducible and moreinfo. Request was from Axel Beckert <abe@debian.org> to control@bugs.debian.org. (Fri, 23 Dec 2011 14:30:07 GMT) Full text and rfc822 format available.

Information forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Fri, 23 Dec 2011 15:12:07 GMT) Full text and rfc822 format available.

Acknowledgement sent to Bruce Momjian <bruce@momjian.us>:
Extra info received and forwarded to list. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Fri, 23 Dec 2011 15:12:07 GMT) Full text and rfc822 format available.

Message #17 received at 652990@bugs.debian.org (full text, mbox):

From: Bruce Momjian <bruce@momjian.us>
To: Axel Beckert <abe@debian.org>
Cc: 652990@bugs.debian.org, Debian Bug Tracking System E-Mail Control Server <control@bugs.debian.org>
Subject: Re: Bug#652990: screen: Cannot bind space to a different action
Date: Fri, 23 Dec 2011 09:45:05 -0500 (EST)
Axel Beckert wrote:
> tag 652990 + unreproducible moreinfo
> kthxbye
> 
> Hi Bruce,
> 
> Bruce Momjian,,, wrote:
> > Package: screen
> > Version: 4.0.3-14
> > Severity: normal
> > 
> > I can cannot change the binding of the spacebar in screen.  If you start 
> > screen with just this configuration file:
> > 
> > 	bind ' ' info
> > 
> > you will find that when you start screen, ^A-space will show the window 
> > info, but once you press Enter, ^A-space will do 'next screen' and never
> > show info again.
> 
> I'm sorry, but I can't reproduce this problem.
> 
> I put "bind ' ' info" as sole line (with line break at the end) in a
> .screenrc, started screen, pressed ^A-Space, it worked fine. I then
> pressed Enter in the shell as well as ^A-Enter, but ^A-Space as well
> as ^A-Enter continue to show the one line window info. Nothing tries
> to switch to the next window, i.e. it works fine for me.
> 
> I tested it on Squeeze amd64 as you seem to have experienced the
> issue on Squeeze amd64.
> 
> Maybe there need some additional requirements to be met to run into
> this issue?

I just found the cause of my odd "Enter" behavior and was about to email
an update.  It turns out if you press ^A, and then space quickly, you
get the (wrong) 'next' behavior, but if press ^A then and then wait for
a second and then press space, you get the (right) configured info
behavior.

I was able to reproduce this same problem with the 'f'/flow binding as
well, so I think it might be more widespread than just the binding of
the spacebar.

Is that reproducible for you?

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +




Information forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Fri, 23 Dec 2011 15:33:03 GMT) Full text and rfc822 format available.

Acknowledgement sent to Axel Beckert <abe@debian.org>:
Extra info received and forwarded to list. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Fri, 23 Dec 2011 15:33:03 GMT) Full text and rfc822 format available.

Message #22 received at 652990@bugs.debian.org (full text, mbox):

From: Axel Beckert <abe@debian.org>
To: Bruce Momjian <bruce@momjian.us>, 652990@bugs.debian.org
Cc: Debian Bug Tracking System E-Mail Control Server <control@bugs.debian.org>
Subject: Re: Bug#652990: screen: Cannot bind space to a different action
Date: Fri, 23 Dec 2011 16:31:27 +0100
tag 652990 - unreproducible moreinfo
kthxbye

Hi Bruce,

thanks for the followup.

Bruce Momjian wrote:
> I just found the cause of my odd "Enter" behavior and was about to email
> an update.  It turns out if you press ^A, and then space quickly, you
> get the (wrong) 'next' behavior, but if press ^A then and then wait for
> a second and then press space, you get the (right) configured info
> behavior. [...] Is that reproducible for you?

Indeed it is -- despite it happened in only about 10% of my tries to
type ^A Space quickly. (Maybe I'm still not typing fast enough all the
time. ;-)

I'll check later if this still happens with the version of screen in
Debian experimental.

		Regards, Axel
-- 
 ,''`.  |  Axel Beckert <abe@debian.org>, http://people.debian.org/~abe/
: :' :  |  Debian Developer, ftp.ch.debian.org Admin
`. `'   |  1024D: F067 EA27 26B9 C3FC 1486  202E C09E 1D89 9593 0EDE
  `-    |  4096R: 2517 B724 C5F6 CA99 5329  6E61 2FF9 CD59 6126 16B5




Removed tag(s) unreproducible and moreinfo. Request was from Axel Beckert <abe@debian.org> to control@bugs.debian.org. (Fri, 23 Dec 2011 15:33:05 GMT) Full text and rfc822 format available.

Information forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Fri, 23 Dec 2011 16:33:03 GMT) Full text and rfc822 format available.

Acknowledgement sent to Bruce Momjian <bruce@momjian.us>:
Extra info received and forwarded to list. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Fri, 23 Dec 2011 16:33:03 GMT) Full text and rfc822 format available.

Message #29 received at 652990@bugs.debian.org (full text, mbox):

From: Bruce Momjian <bruce@momjian.us>
To: Axel Beckert <abe@debian.org>
Cc: 652990@bugs.debian.org
Subject: Re: Bug#652990: screen: Cannot bind space to a different action
Date: Fri, 23 Dec 2011 11:29:46 -0500 (EST)
Axel Beckert wrote:
> tag 652990 - unreproducible moreinfo
> kthxbye
> 
> Hi Bruce,
> 
> thanks for the followup.
> 
> Bruce Momjian wrote:
> > I just found the cause of my odd "Enter" behavior and was about to email
> > an update.  It turns out if you press ^A, and then space quickly, you
> > get the (wrong) 'next' behavior, but if press ^A then and then wait for
> > a second and then press space, you get the (right) configured info
> > behavior. [...] Is that reproducible for you?
> 
> Indeed it is -- despite it happened in only about 10% of my tries to
> type ^A Space quickly. (Maybe I'm still not typing fast enough all the
> time. ;-)

Well, that is good to hear.  I seem to type so fast that it took me two
days realize slowing down made it work.  ;-)

> I'll check later if this still happens with the version of screen in
> Debian experimental.

Thanks.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +




Information forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Wed, 11 Jan 2012 15:39:06 GMT) Full text and rfc822 format available.

Acknowledgement sent to Bruce Momjian <bruce@momjian.us>:
Extra info received and forwarded to list. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Wed, 11 Jan 2012 15:39:06 GMT) Full text and rfc822 format available.

Message #34 received at 652990@bugs.debian.org (full text, mbox):

From: Bruce Momjian <bruce@momjian.us>
To: Axel Beckert <abe@debian.org>
Cc: 652990@bugs.debian.org, Debian Bug Tracking System E-Mail Control Server <control@bugs.debian.org>
Subject: Re: Bug#652990: screen: Cannot bind space to a different action
Date: Wed, 11 Jan 2012 10:37:35 -0500
On Fri, Dec 23, 2011 at 04:31:27PM +0100, Axel Beckert wrote:
> tag 652990 - unreproducible moreinfo
> kthxbye
> 
> Hi Bruce,
> 
> thanks for the followup.
> 
> Bruce Momjian wrote:
> > I just found the cause of my odd "Enter" behavior and was about to email
> > an update.  It turns out if you press ^A, and then space quickly, you
> > get the (wrong) 'next' behavior, but if press ^A then and then wait for
> > a second and then press space, you get the (right) configured info
> > behavior. [...] Is that reproducible for you?
> 
> Indeed it is -- despite it happened in only about 10% of my tries to
> type ^A Space quickly. (Maybe I'm still not typing fast enough all the
> time. ;-)
> 
> I'll check later if this still happens with the version of screen in
> Debian experimental.

Any update on this?

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +




Information forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Wed, 11 Jan 2012 18:03:05 GMT) Full text and rfc822 format available.

Acknowledgement sent to Axel Beckert <abe@debian.org>:
Extra info received and forwarded to list. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Wed, 11 Jan 2012 18:03:05 GMT) Full text and rfc822 format available.

Message #39 received at 652990@bugs.debian.org (full text, mbox):

From: Axel Beckert <abe@debian.org>
To: Bruce Momjian <bruce@momjian.us>
Cc: 652990@bugs.debian.org, Debian Bug Tracking System E-Mail Control Server <control@bugs.debian.org>
Subject: Re: Bug#652990: screen: Cannot bind space to a different action
Date: Wed, 11 Jan 2012 19:00:52 +0100
tag 652990 + confirmed upstream
retitle 652990 screen: Binding a key to a different action sometimes still yields the default binding
forwarded 652990 https://savannah.gnu.org/bugs/index.php?35287
kthxbye

Hi Bruce,

thanks for the reminder.

Bruce Momjian wrote:
> > > I just found the cause of my odd "Enter" behavior and was about to email
> > > an update.  It turns out if you press ^A, and then space quickly, you
> > > get the (wrong) 'next' behavior, but if press ^A then and then wait for
> > > a second and then press space, you get the (right) configured info
> > > behavior. [...] Is that reproducible for you?
> > 
> > Indeed it is -- despite it happened in only about 10% of my tries to
> > type ^A Space quickly. (Maybe I'm still not typing fast enough all the
> > time. ;-)
> > 
> > I'll check later if this still happens with the version of screen in
> > Debian experimental.
> 
> Any update on this?

Yes, and I'm sorry to say that it still happens with the newest
upstream version and does not only happen with space. I could also
reproduce it with the key "c" instead.

I reported it to the GNU Screen developers at
https://savannah.gnu.org/bugs/index.php?35287

		Regards, Axel
-- 
 ,''`.  |  Axel Beckert <abe@debian.org>, http://people.debian.org/~abe/
: :' :  |  Debian Developer, ftp.ch.debian.org Admin
`. `'   |  1024D: F067 EA27 26B9 C3FC 1486  202E C09E 1D89 9593 0EDE
  `-    |  4096R: 2517 B724 C5F6 CA99 5329  6E61 2FF9 CD59 6126 16B5




Added tag(s) upstream and confirmed. Request was from Axel Beckert <abe@debian.org> to control@bugs.debian.org. (Wed, 11 Jan 2012 18:03:11 GMT) Full text and rfc822 format available.

Changed Bug title to 'screen: Binding a key to a different action sometimes still yields the default binding' from 'screen: Cannot bind space to a different action' Request was from Axel Beckert <abe@debian.org> to control@bugs.debian.org. (Wed, 11 Jan 2012 18:03:12 GMT) Full text and rfc822 format available.

Set Bug forwarded-to-address to 'https://savannah.gnu.org/bugs/index.php?35287'. Request was from Axel Beckert <abe@debian.org> to control@bugs.debian.org. (Wed, 11 Jan 2012 18:03:13 GMT) Full text and rfc822 format available.

Information forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Tue, 17 Jan 2012 02:03:04 GMT) Full text and rfc822 format available.

Acknowledgement sent to Bruce Momjian <bruce@momjian.us>:
Extra info received and forwarded to list. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Tue, 17 Jan 2012 02:03:04 GMT) Full text and rfc822 format available.

Message #50 received at 652990@bugs.debian.org (full text, mbox):

From: Bruce Momjian <bruce@momjian.us>
To: Axel Beckert <abe@debian.org>
Cc: 652990@bugs.debian.org
Subject: Re: Bug#652990: screen: Cannot bind space to a different action
Date: Mon, 16 Jan 2012 20:59:58 -0500
On Wed, Jan 11, 2012 at 07:00:52PM +0100, Axel Beckert wrote:
> tag 652990 + confirmed upstream
> retitle 652990 screen: Binding a key to a different action sometimes still yields the default binding
> forwarded 652990 https://savannah.gnu.org/bugs/index.php?35287
> kthxbye
> 
> Hi Bruce,
> 
> thanks for the reminder.
> 
> Bruce Momjian wrote:
> > > > I just found the cause of my odd "Enter" behavior and was about to email
> > > > an update.  It turns out if you press ^A, and then space quickly, you
> > > > get the (wrong) 'next' behavior, but if press ^A then and then wait for
> > > > a second and then press space, you get the (right) configured info
> > > > behavior. [...] Is that reproducible for you?
> > > 
> > > Indeed it is -- despite it happened in only about 10% of my tries to
> > > type ^A Space quickly. (Maybe I'm still not typing fast enough all the
> > > time. ;-)
> > > 
> > > I'll check later if this still happens with the version of screen in
> > > Debian experimental.
> > 
> > Any update on this?
> 
> Yes, and I'm sorry to say that it still happens with the newest
> upstream version and does not only happen with space. I could also
> reproduce it with the key "c" instead.
> 
> I reported it to the GNU Screen developers at
> https://savannah.gnu.org/bugs/index.php?35287

Having seen no activity on this, I decided to dig into the code in a
serious way.  I added some debug statements and put screen in debug mode
and found that the read() call in disp_readev_fn() was returning ^@ (the
null byte) for space when typed quickly.  Here is my debug output:

	>  + hit ev fd 4 type 1!
	> size = 4096
	> char = ^Z len = 1
	> disp_readev_fn 2
	> ProcessInput: 1 bytes
	> cmp2 ^Z
	> cmp ^Z ESC[3]
	> complete miss
	> ProcessInput2: 1 bytes
	>  - ilen now 1 bytes
	>  + hit ev fd 0 type 3!
	> serv_select_fn called
	> waiting for events:
	>  - fd 4 type 1 pri 0
	>  - fd 4 type 2 pri 0
	>  - fd 8 type 1 pri 0
	>  - fd 8 type 2 pri 0
	>  - fd 5 type 1 pri 0
	>  - fd 0 type 3 pri -10
	>  - cond ev fd 4 type 2 failed
	>  - cond ev fd 8 type 2 failed
	> readfds: 4 5 8
	> writefds:
	>  + hit ev fd 4 type 1!
	> size = 4096
-->	> char = ^@ len = 1
	> disp_readev_fn 2
	> ProcessInput: 1 bytes
	> cmp2 ^@
	> cmp ^@ ESC[3]
	> complete miss
	> ProcessInput2: 1 bytes
	>  - ilen now 1 bytes
	> AclCheckPermCmd(root 0 next) = 0

Now, read() returning a null byte for space is really odd, and I have no
idea what would cause that.  With that information, I decided to add
this to my screenrc:

	# fix screen bug caused by typing fast, 'space' becomes null byte, 2012-01-16
	bind ^@ other

This does fix my immediate problem of meta-space not working.  I suspect
that other cases also might return a null byte, but I am not sure that
is a problem for me.

I am not clear now if the problem is that type fast causes the default
action, or type fast causes 'next' because next is bound to the null
byte.

Let me know if you want my debug diff but I basically just output the
byte the read() returned (assuming size > 0).  Hopefully this will give
someone a place to continue debugging this.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +




Information forwarded to debian-bugs-dist@lists.debian.org, Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>:
Bug#652990; Package screen. (Wed, 18 Jan 2012 15:15:13 GMT) Full text and rfc822 format available.

Acknowledgement sent to Bruce Momjian <bruce@momjian.us>:
Extra info received and forwarded to list. Copy sent to Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>. (Wed, 18 Jan 2012 15:15:13 GMT) Full text and rfc822 format available.

Message #55 received at 652990@bugs.debian.org (full text, mbox):

From: Bruce Momjian <bruce@momjian.us>
To: Axel Beckert <abe@debian.org>
Cc: 652990@bugs.debian.org
Subject: Re: Bug#652990: screen: Cannot bind space to a different action
Date: Wed, 18 Jan 2012 10:13:00 -0500
> On Wed, Jan 11, 2012 at 07:00:52PM +0100, Axel Beckert wrote:
> I reported it to the GNU Screen developers at
> https://savannah.gnu.org/bugs/index.php?35287

I did some more thinking on this and I think I have a conclusion.

First, my initial report was wrong --- typing fast does not trigger the
default action --- it triggers the control-key action for the second
key, e.g. ^A-space yields ^A-control(space), which also happens to be
^@, or the null byte.  This probably happens because the control was
down for the ^A, and might pass into the next key.

Second, I notice that they map control(space) to the same action as
space in the default bindings (which were not modified by Debian):

    ktab[' '].nr = ktab[Ctrl(' ')].nr =
                        ---------
    ktab['n'].nr = ktab[Ctrl('n')].nr = RC_NEXT;

Third, because the control-space (^@) is coming from the read() kernel
call (and I don't see them remapping 'read' to their own function), I
realized the problem might not be with screen but perhaps the terminal
driver.  However, I tried to reproduce the problem from the command line
by typing ^A-space quickly and did not see that behavior.

I then started to wonder why I had not see this behavior with screen on
my previous BSD system so I booted it up, and found it has exactly the
fix I just discovered, e.g. binding ^@ to the same action as space.

So, I think I have a solution for my problem, and that is to map
control-key to the same action as the non-control key.  I see them doing
that in several default screen bindings, and I will just follow that if
I see another key exhibiting this problem.

So, for me, I don't need to peruse this issue further, but am available
if someone else needs help on this.  Thanks for looking into this for me.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +




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