Problem with VCS_INFO's disable-patterns

[Marco Hinz <mh.codebro@xxxxxxxxx>]

Hi,


Problem
=======

I have the following in my zshrc:

    zstyle ':vcs_info:*' disable-patterns '/data/linux/stable(|/*)'

Now, when I switch to that directory or any of its subfolders, I get the
following error:

    VCS_INFO_set:typeset:11: not valid in this context: vcs_info_msg_-1_

When vcs_info() is executed, $maxexports apparently is 0 at:
https://github.com/zsh-users/zsh/blob/master/Functions/VCS_Info/vcs_info#L97

Then, in the loop {0..-1} gets expended and fails at typeset:
https://github.com/zsh-users/zsh/blob/master/Functions/VCS_Info/VCS_INFO_set#L10-L11


Possible solution
=================

The line before the loop contains:

    [[ $2 == '-preinit-' ]] && (( maxexports == 0 )) && (( maxexports = 1 ))

The condition for '-preinit-' is probably there on purpose, but for my
problem case (where $2 doesn't exist), this would work fine:

    (( maxexports == 0 )) && (( maxexports = 1 ))

But that probably doesn't fix the root of the problem and breaks stuff
in other cases.

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