Re: Bug with (or without) 'Z' in cpoptions writing to read-only file

Linda W wrote:

> > This used to work, but stopped about 18 months ago, I think.
> >
> > Now, I've both with 'Z' and without in cpoptions, but
> > notice when I write a file with "w!", the read-only flag
> > is still being reset to it's initial state.
> I have figured out at least one place that causes this..
>
> It seems that some .vim scripts ignore the options in cpo
> and install '&vim' options while the file is being
> saved, then restore cpo after the fact so it looks like
> the cpo options have no effect.
>
> I don't think it would be affecting my usage, but an example of this
> is in "menu.vim"...
> Several places, the purpose is to make sure the "<" and "C" flags
> are not included in cpoptions...
> But that's not what the code does -- it resets them to some arbitrary state.
>
> To remove those flags, one would use
> cpo-="<C"
> (as far as I know)....
>
> Trouble is, with examples like that in the official Vim code, there's no
> telling where else it might be a problem.
>
> though I noticed signs that I've edited out those problem areas before
> (but had my changes overwritten on a subsequent update.

Good point. However, for most plugins it's fine to reset 'cpo', since
they only setup mappings, highlighting, etc. And for these it's a lot
easier to just switch to a "sane state".

Unfortunately this means we have to pinpoint individual plugins to find
out what's wrong.

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