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Date: Wed, 16 Mar 2016 14:00:12 +0000
From: Adam Dinwoodie <adam AT dinwoodie DOT org>
To: cygwin AT cygwin DOT com
Subject: Re: Running texconfig breaks backspace in Bash/MinTTY
Message-ID: <20160316140012.GP29016@dinwoodie.org>
References: <20160316114546 DOT GO29016 AT dinwoodie DOT org> <56E952E5 DOT 2000205 AT cornell DOT edu>
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In-Reply-To: <56E952E5.2000205@cornell.edu>
User-Agent: Mutt/1.5.21 (2010-09-15)

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.

> Could this have something to do with fzf?

No; I uninstalled it to check.

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.

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