Hello,
I found an error on patch 8.0.0736.
With the following sample function,
'diffthis' and 'diffoff' will cause
"E788: Not allowed to edit anoter buffer now"
on 'wincmd'.
augroup xyz
au!
au OptionSet * call XYZ()
augroup END
function! XYZ()
if expand('<amatch>') == 'diff'
let c = winnr()
for w in range(1, winnr('$'))
exec w . 'wincmd w'
echo w . ':' . &diff
endfor
exec c . 'wincmd w'
endif
endfunction
The error does not happens when I removed
++curbuf_lock;
--curbuf_lock;
in set_diff_option() of diff.c.
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