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X-HELO:	calimero.vinschen.de
Date:	Mon, 1 Aug 2016 10:51:09 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: [PATCH] Strange behavior of cmd.exe when hammered with clear screen operations from Cygwin program.
Message-ID:	<20160801085109.GC3470@calimero.vinschen.de>
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References:	<0ee6699f198b7b0f588054ba2f829db5 AT mail DOT kylheku DOT com> <20160728195135 DOT GC26311 AT calimero DOT vinschen DOT de> <20160729103927 DOT GB5963 AT calimero DOT vinschen DOT de> <f00a28ea8ac7ea704e6374f8a5cc5c88 AT mail DOT kylheku DOT com>
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On Jul 29 08:59, Kaz Kylheku wrote:
> On 29.07.2016 03:39, Corinna Vinschen wrote:
> > I applied a patch to perform this action.  It's in the latest
> > 2.6.0-0.5 test release I just announced.
> [...]
> I've done some interactive testing with this using
> the interpreter for a Lisp dialect. I would evaluate
> this expression to generate a 5 second delay and then
> a clear screen VT100 sequence:
>=20
>   (progn (usleep 5000000) (put-string "\e[2J"))
>=20
> during this time, I would scroll the buffer somewhere.
>=20
> I also tested with a cursor position somewhere in the
> middle of the window, having issued:
>=20
>   (put-string "\e[12H")
>=20
> The programming language details don't matter; we
> could do this with bash echo $'\e...' and sleep 5.
> [...]
> With the third patch, I've run into behavior in which the
> display isn't cleared at all if the clear is issued
> in a scrolled-back state.

I can't reproduce this.  If I don't click wildly on the scroll bat at
the time the clear screen action takes place (so I move the window right
after clear screen), the cursor is positioned at the top of the screen,
at the end of the buffer.  So, how would I reproduce your observation so
that all window positioning is guaranteed to take place *before* the
clear screen action and still see the broken output?


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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