I confirm that this issue has been fixed by Patch 7.4a.027 and subseqent, but only partially. The same errors can occur when Python deletes lines in another buffer. The following tests show how to reproduce (also attached). Tested with Vim 7.4a BETA, patches 1-39, compiled with MinGW, Windows 8.
"---vim74a_E315_test2.vim-----------------------------
tabnew BUFFER1
call setline(1, ['','aaa {{{1','bbb {{{2','ccc {{{3'])
setl fdm=marker fdt=getline(v:foldstart) fdl=0
" 'splitbelow' is needed to get ml_get errors.
set splitbelow
new BUFFER2
py import vim
py B2=vim.current.buffer
wincmd p
py B2[0]='BUFFER2...'
for i in range(10)
py B2.append(['xxx','yyy'])
py del B2[-1]
endfor
" Multiple errors 'E315: ml_get: invalid lnum: 3'.
" Folding is wrong in BUFFER1--there are no folds.
"---vim74a_E315_test3.vim-----------------------------
tabnew BUFFER1
call setline(1, ['','aaa {{{1','bbb {{{2','ccc {{{3'])
setl fdm=marker fdt=getline(v:foldstart) fdl=0
new BUFFER2
py import vim
py B2=vim.current.buffer
wincmd p
py B2.append(['xxx','yyy'])
" This does not cause ml_get errors, but disrupts folding.
py del B2[-1]
" Folds are now wrong in BUFFER1.
Regards,
Vlad
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vim74a_E315_test2.vim
Description: Binary data
vim74a_E315_test3.vim
Description: Binary data
