From f7fde0173af95925e7324b7d3c09776173dab8a7 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Thu, 1 Aug 2024 10:13:45 +0800
Subject: vim-patch:9.0.0632: calling a function from an "expr" option has
 overhead

Problem:    Calling a function from an "expr" option has too much overhead.
Solution:   Add call_simple_func() and use it for 'foldexpr'

https://github.com/vim/vim/commit/87b4e5c5db9d1cfd6f2e79656e1a6cff3c69d15f

Cherry-pick a call_func() change from patch 8.2.1343.
Add expr-option-function docs to options.txt.

Co-authored-by: Bram Moolenaar <Bram@vim.org>
---
 test/old/testdir/test_fold.vim | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'test')

diff --git a/test/old/testdir/test_fold.vim b/test/old/testdir/test_fold.vim
index 36f72f5e01..a0eb3afdbb 100644
--- a/test/old/testdir/test_fold.vim
+++ b/test/old/testdir/test_fold.vim
@@ -386,6 +386,32 @@ func Test_foldexpr_no_interrupt_addsub()
   set foldmethod& foldexpr&
 endfunc
 
+" Fold function defined in another script
+func Test_foldexpr_compiled()
+  throw 'Skipped: Vim9 script is N/A'
+  new
+  let lines =<< trim END
+      vim9script
+      def FoldFunc(): number
+        return v:lnum
+      enddef
+
+      set foldmethod=expr
+      set foldexpr=s:FoldFunc()
+  END
+  call writefile(lines, 'XfoldExpr', 'D')
+  source XfoldExpr
+
+  call setline(1, ['one', 'two', 'three'])
+  redraw
+  call assert_equal(1, foldlevel(1))
+  call assert_equal(2, foldlevel(2))
+  call assert_equal(3, foldlevel(3))
+
+  bwipe!
+  set foldmethod& foldexpr&
+endfunc
+
 func Check_foldlevels(expected)
   call assert_equal(a:expected, map(range(1, line('$')), 'foldlevel(v:val)'))
 endfunc
-- 
cgit