patch 8.2.2271: ml_get error when changing hidden buffer in Python
Problem: ml_get error when changing hidden buffer in Python.
Solution: Block updating folds. (closes #7598)
diff --git a/src/testdir/test_python3.vim b/src/testdir/test_python3.vim
index 7765071..6afb76d 100644
--- a/src/testdir/test_python3.vim
+++ b/src/testdir/test_python3.vim
@@ -4016,4 +4016,37 @@
sunmap <Esc>@
endfunc
+func Test_python3_fold_hidden_buffer()
+ CheckFeature folding
+
+ set fdm=expr fde=Fde(v:lnum)
+ let b:regex = '^'
+ func Fde(lnum)
+ let ld = [{}]
+ let lines = bufnr('%')->getbufline(1, '$')
+ let was_import = 0
+ for lnum in range(1, len(lines))
+ let line = lines[lnum]
+ call add(ld, {'a': b:regex})
+ let ld[lnum].foldexpr = was_import ? 1 : '>1'
+ let was_import = 1
+ endfor
+ return ld[a:lnum].foldexpr
+ endfunc
+
+ call setline(1, repeat([''], 15) + repeat(['from'], 3))
+ eval repeat(['x'], 17)->writefile('Xa.txt')
+ split Xa.txt
+ py3 import vim
+ py3 b = vim.current.buffer
+ py3 aaa = b[:]
+ hide
+ py3 b[:] = aaa
+
+ call delete('Xa.txt')
+ set fdm& fde&
+ delfunc Fde
+ bwipe! Xa.txt
+endfunc
+
" vim: shiftwidth=2 sts=2 expandtab