Thanks for adding the DiffUpdated autocommand event.

I've been trying to use the DiffUpdated and OptionSet autocommand
events to update some option settings and I think I've found a bug
in the OptionSet event: v:option_old and v:option_new are not set
when the option is diff.  I'm using Vim 8.1.401.

When I execute the following autocommand definition,

    :autocmd OptionSet diff echo "OptionSet diff" v:option_old v:option_new

followed by

    :set diff
    :set nodiff

all I see displayed in the status line for each of those is

    OptionSet diff

but no values for either v:option_old or v:option_new.

Repeating the experiment, but replacing "diff" by "number" yields
the expected results:

    OptionSet number 0 1
    OptionSet number 1 0

Regards,
Gary

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