# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1609592404 -3600
# Node ID f6514ca9f45ece567b0966324c9696123a3dcd5b
# Parent  4277c9dbafb9bd441357797ca9d9041f6c42fe68
patch 8.2.2271: ml_get error when changing hidden buffer in Python

Commit: https://github.com/vim/vim/commit/3e0107ea16349b354e0e9712e95b09ef019e99e5
Author: Bram Moolenaar <Bram@vim.org>
Date:   Sat Jan 2 13:53:59 2021 +0100

    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 https://github.com/vim/vim/issues/7598)

diff --git a/src/evalbuffer.c b/src/evalbuffer.c
--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -807,6 +807,9 @@ f_setline(typval_T *argvars, typval_T *r
 switch_buffer(bufref_T *save_curbuf, buf_T *buf)
 {
     block_autocmds();
+#ifdef FEAT_FOLDING
+    ++disable_fold_update;
+#endif
     set_bufref(save_curbuf, curbuf);
     --curbuf->b_nwindows;
     curbuf = buf;
@@ -821,6 +824,9 @@ switch_buffer(bufref_T *save_curbuf, buf
 restore_buffer(bufref_T *save_curbuf)
 {
     unblock_autocmds();
+#ifdef FEAT_FOLDING
+    --disable_fold_update;
+#endif
     // Check for valid buffer, just in case.
     if (bufref_valid(save_curbuf))
     {
diff --git a/src/testdir/test_python3.vim b/src/testdir/test_python3.vim
--- a/src/testdir/test_python3.vim
+++ b/src/testdir/test_python3.vim
@@ -4016,4 +4016,37 @@ func Test_python3_non_utf8_string()
   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
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2271,
+/**/
     2270,
 /**/
     2269,