I get E315 errors in Vim 7.4a, but not in Vim 7.3.829 and earlier. In a nutshell, when a buffer in another window is modified via Python buffer object, folds in the current buffer get messed up, jumping to the last line results in multiple E315.
The script below shows how to reproduce (also attached).
Specs: gVim 7.4a BETA (extracted from Windows installer, not
installed), Windows 8 64-bit, Python 2.7.5, Python 3.3.2. (I did not
test this with Python 3 because dll versions don't match.)
" ---BEGIN---
" Create buffer 1 with closed folds.
tabnew Buffer1
call setline(1, ['','aaa {{{1','bbb {{{2','ccc {{{3'])
setl fdm=marker fdt=getline(v:foldstart) fdl=0
" Create buffer 2 in another window.
new Buffer2
py import vim
py B2=vim.current.buffer
" Go back to buffer 1. Modify buffer 2 via Python.
wincmd w
" This alone messes up folding in the current buffer.
py B2.append(['xxx','yyy'])
" This results in multiple 'E315: ml_get: invalid lnum: 6'.
" A spurious window appears sometimes.
" Custom statusline and tabline are also disrupted.
normal! ggVG
" ---END---
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vim74a_E315.vim
Description: Binary data
