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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