Re: [vile] Here is the file which demonstrates the insert bug

[Thomas Dickey]

On Tue, 22 Apr 2008, Chris G wrote:

> I hae just imported testBug to my home system and I get the same error
> when I delete and then retype http://home.isbd.net/gallery2/main.php
> if I run in an 80 column window.  The bug doesn't occur when run in a
> wider window such that text doesn't scroll off screen.
>
> When the bug occurs vile eats processor time!
>
> OK, the bug *doesn't* occur when I move my .vilerc file.  I'll try
> restoring it bit by bit.
>
> Wierdly the bug only occurs after a certain number of characters have
> scrolled off to the right.  I.e. if you open testBug, delete the URL
> and then just insert characters it dies after half a dozen or so
> characters have scrolled off.
>
> OK, the bug still occurs with my .vilerc cut down to:-
>
>    set autoindent wrapmargin=10

When I do this (on a BSD account at hand), I see the line fold up just as
I type the "e" in gallery, e.g.,

                                <li><a href="http://home.isbd.net/gallery2/main>
                                <li><a
                                href="http://home.isbd.net/galle";>Pictures</a><>

Perhaps it'll be different on Linux - the line did not fold up in this
way with the normal vileinit.rc

> Removing either autoindent or wrapmargin=10 stops the bug occurring.
>
> So it's some interaction of wrapmargin (causing auto wrap, which it
> does during the insertion) and autoindent.  However the bug doesn't
> occur at the moment the automatic wrap happens, the wrap occurs
> (because of the space between the a and href) and then after some more
> insertions vile hangs.  I suppose it *could* just be an autoindent
> bug.

I also see the screen flashing after I've inseted a few more characters,
but (inserting another 80 or so), it's not hanging on the BSD system...).

However - the BSD system doesn't have any noticeable locale support.
Perhaps the bug is in one of the multibyte adjustments.  I'll be
able to verify that tonight.

> As I see it (and I've just reproduced the bug using different text) it
> happens when you are inserting text in a long line such that text to
> the right is scrolling off screen and (because there's a space
> somewhere before the text you are inserting) the line auto wraps
> (because of wrapmagin) and autoindents because the line you were
> inserting into is indented.  Further insertions (not quite sure how
> many) provoke the bug.
>
> Phew!  :-)
>
> --
> Chris Green
>
>
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--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net