On 2018-09-19, Bram Moolenaar wrote:
> Gary Johnson wrote:
> > I discovered that the outputs were correct up to a point, then the
> > values of v:option_old and v:option_new became empty. That occurred
> > after the following autocommand.
> >
> > autocmd OptionSet diff if &diff && !exists("g:ve") | let g:ve = &ve |
> > set ve=all | endif
> >
> > I don't know what's going on, but something in that autocommand
> > causes v:option_old and v:option_new to be cleared.
>
> It's the ":set ve=all" command, it tries triggering OptionSet again,
> which probably doesn't do anything because of nesting, but it does clear
> the v:option_new and v:option_old variables.
>
> Perhaps we can do this:
>
> --- git/vim81/src/option.c 2018-09-13 20:31:47.111018149 +0200
> +++ option.c 2018-09-19 23:18:45.761370196 +0200
...
After applying that patch, the OptionSet event doesn't appear to be
triggered at all. I executed the following:
:autocmd OptionSet diff echo "OptionSet diff" v:option_old v:option_new
:autocmd OptionSet * echo "OptionSet any" v:option_old v:option_new
:autocmd OptionSet * echom "OptionSet any" v:option_old v:option_new
and tried setting and unsetting 'diff' and 'number' and never saw
a message.
Regards,
Gary
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