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X-HELO: calimero.vinschen.de
Date: Thu, 28 Jul 2016 22:00:35 +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: <20160728200035.GF26311@calimero.vinschen.de>
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References: <0ee6699f198b7b0f588054ba2f829db5 AT mail DOT kylheku DOT com> <20160728195135 DOT GC26311 AT calimero DOT vinschen DOT de>
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On Jul 28 21:51, Corinna Vinschen wrote:
> The situation I was thinking about is a bit different.  Consider an only
> partially filled console buffer.  In contrast to your typical UNIX
> terminal application the buffer doesn't grow.  It's a fixed size and the
> scroll bar reflects this buffer size right from the start.  So the user
> can scroll the console windows down into the not yet used buffer area,
> i.e.:
>=20
> Before:
>=20
>    buffer
>    +---
>    | nonblank
>    | nonblank
>    | blank
>    | blank
>    | > [] cursor
>    | blank
>    | blank      window
>    | blank      ---+
>    | blank         |
>    | blank         |
>    | blank      ---+
>    | blank
>    +---
>=20
> Performing the clear screen in this situation, the cursor will be
> repositioned to the first line in the current window and the blank lines
> between the old cursor position and the new cursor position

... will invariably become part of the buffer.  Sorry, I lost track
mid-sentence.


Corinna

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

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