From a80ec88906220b6527c553f7614180ba3bfde169 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Thu, 10 Mar 2022 16:57:54 +0800
Subject: test: add a test for #17489

---
 test/functional/editor/completion_spec.lua | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'test')

diff --git a/test/functional/editor/completion_spec.lua b/test/functional/editor/completion_spec.lua
index befad29922..1a0ee54505 100644
--- a/test/functional/editor/completion_spec.lua
+++ b/test/functional/editor/completion_spec.lua
@@ -1193,4 +1193,23 @@ describe('completion', function()
     eq('foobar', eval('g:word'))
     feed('<esc>')
   end)
+
+  it('does not crash if text is changed by first call to complete function #17489', function()
+    source([[
+      func Complete(findstart, base) abort
+        if a:findstart
+          let col = col('.')
+          call complete_add('#')
+          return col - 1
+        else
+          return []
+        endif
+      endfunc
+
+      set completeopt=longest
+      set completefunc=Complete
+    ]])
+    feed('ifoo#<C-X><C-U>')
+    assert_alive()
+  end)
 end)
-- 
cgit