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e02755cd9f
Problem:
`:set foo=<tab>` and `:set foo?` for func/expr options set to a Lua
function, always displays "v:lua".
The existing "<Lua N: file:line>" form was avoided because the ref id
N changes on every read of the same option.
Solution:
- Don't attempt to tab-complete Lua functions.
- Show "<Lua file:line>" (or "<Lua>" if source file is unknown).
Example:
:set operatorfunc?
operatorfunc=<Lua ~/.config/nvim/init.lua:42>