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Re: Too long lines in the echo area of the stand-alone Info reader

From: Gavin Smith
Subject: Re: Too long lines in the echo area of the stand-alone Info reader
Date: Thu, 25 Dec 2014 16:38:03 +0000

On Wed, Dec 24, 2014 at 5:53 PM, Eli Zaretskii <address@hidden> wrote:
> While working on the MinGW port of Info, I noticed an annoying
> problem: the welcome message displayed in the echo area when the
> reader starts up causes the entire display to scroll up one line,
> which messes up the display until you scroll the main window once or
> twice.
> The current version string, "5.2dev", is just long enough to cause the
> welcome message overflow the 80-column line width, so the code appends
> the continuation backslash in the last column.  But at least on the
> Windows console, doing so causes the cursor move into the beginning of
> the next line, and since this is the last line of the screen, the
> entire display is then scrolled up.
> Looking through the code in display_update_window_1, I don't see any
> attempt to handle this situation.  Does the code assume that writing a
> character at the last column of the last display line doesn't cause
> such a scroll?  If so, is that a portable assumption, even if only
> Posix TTYs are considered?  ISTR that in the Less program there is a
> more elaborate handling of at least 3 different behaviors in this
> situation, perhaps Info should do something similar as well?

I have committed a change that should make this work as before.

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