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Subject: Re: Running texconfig breaks backspace in Bash/MinTTY
To: cygwin AT cygwin DOT com
References: <20160316114546 DOT GO29016 AT dinwoodie DOT org> <56E952E5 DOT 2000205 AT cornell DOT edu> <20160316140012 DOT GP29016 AT dinwoodie DOT org> <56E9769B DOT 5050901 AT cornell DOT edu>
From: Thomas Wolff <towo AT towo DOT net>
Message-ID: <56E9DA19.4000700@towo.net>
Date: Wed, 16 Mar 2016 23:11:37 +0100
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Am 16.03.2016 um 16:07 schrieb Ken Brown:
> On 3/16/2016 10:00 AM, Adam Dinwoodie wrote:
>> On Wed, Mar 16, 2016 at 08:34:45AM -0400, Ken Brown wrote:
>>> On 3/16/2016 7:45 AM, Adam Dinwoodie wrote:
>>>> Here's an interesting bug: normally in a Bash session in MinTTY,
>>>> backspace and Ctrl+H both delete the previous character, as expected.
>>>> However, after running texconfig and returning to the shell, both the
>>>> backspace key and Ctrl+H appear to just print "^H" to the terminal.
>>>>
>>>> It looks like this is genuinely the terminal trying to render a
>>>> backspace character, rather than just backspacing, given the 
>>>> following:
>>>>
>>>>      $ printf ^H | xxd
>>>>      00000000: 08                                       .
>>>>
>>>> (To get that, I typed "printf {backspace} | xxd".)
>>>>
>>>> It's not clear to me whether this is Bash, MinTTY or texconfig that's
>>>> misbehaving.  Ctrl+W to delete a word, Ctrl+R to get (for me) fzf's
>>>> history search, and using the up and down arrows to navigate 
>>>> history all
>>>> work.  Running Vim, opening a new Bash shell from within the duff one,
>>>> or SSHing to another box has Ctrl+H working just fine within that
>>>> process, but the bugged behaviour resumes when I return to the 
>>>> original
>>>> Bash shell.
>>>
>>> I can't reproduce this on my system.  I tried 'texconfig --help' and
>>> 'texconfig conf'.  What's the precise texconfig command that you
>>> used?
>>
>> I'm just running `texconfig`, with no arguments.  There's a warning
>> prompt, that you press Enter to clear, then there's an interactive menu
>> that appears -- I'm assuming it's something about that interactive menu
>> that's causing the problem.
>
> In the interactive case, texconfig calls texconfig-dialog, which calls 
> dialog.
>
>> Turns out, after some digging, MinTTY's "Keys" > "Backspace sends ^H"
>> setting is critical here -- my .minttyrc has `BackspaceSendsBS=yes`, but
>> if I remove that line and restart MinTTY, everything works fine.  If I
>> add that setting to a fresh Cygwin install that contains only the Base
>> packages, texlive-collection-basic, and their dependencies, I can
>> reproduce the issue.
>>
>> That probably explains why you can't reproduce it, but it still seems
>> like a bug -- I wouldn't expect backspace behaviour to change in that
>> fashion regardless of that bit of configuration.
>
> So it appears to be a MinTTY/dialog issue.
Checking stty -a before and after texconfig reveals that texconfig 
mangles the stty erase setting and does not restore it.
That is clearly a bug of texconfig.
------
Thomas

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