From dbc2678f46970703616765dadff1234fdcce27b7 Mon Sep 17 00:00:00 2001
From: glepnir <glephunter@gmail.com>
Date: Mon, 27 May 2024 22:02:24 +0800
Subject: [PATCH] vim-patch:9.1.0447: completion may be wrong when deleting all
 chars (#29040)

Problem:  completion may be wrong when deleting all chars.
Solution: reset compl_shown_match (glepnir).

closes: https://github.com/vim/vim/pull/14854

https://github.com/vim/vim/commit/53387c55a13bc1013a6ab721d4bd0bd04c6935c4
---
 src/nvim/insexpand.c                   |  4 ++++
 test/old/testdir/test_ins_complete.vim | 16 ++++++++--------
 test/old/testdir/test_popup.vim        |  2 ++
 3 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/src/nvim/insexpand.c b/src/nvim/insexpand.c
index b557b9802e..8b1c09b32f 100644
--- a/src/nvim/insexpand.c
+++ b/src/nvim/insexpand.c
@@ -1198,6 +1198,10 @@ static int ins_compl_build_pum(void)
   // match after it, don't highlight anything.
   bool shown_match_ok = match_at_original_text(compl_shown_match);
 
+  if (strequal(compl_leader, compl_orig_text) && !shown_match_ok) {
+    compl_shown_match = compl_no_select ? compl_first_match : compl_first_match->cp_next;
+  }
+
   compl_T *shown_compl = NULL;
   bool did_find_shown_match = false;
   int cur = -1;
diff --git a/test/old/testdir/test_ins_complete.vim b/test/old/testdir/test_ins_complete.vim
index 3f67a06999..45db2a7364 100644
--- a/test/old/testdir/test_ins_complete.vim
+++ b/test/old/testdir/test_ins_complete.vim
@@ -700,14 +700,14 @@ func Test_pum_with_preview_win()
   CheckScreendump
 
   let lines =<< trim END
-      funct Omni_test(findstart, base)
-	if a:findstart
-	  return col(".") - 1
-	endif
-	return [#{word: "one", info: "1info"}, #{word: "two", info: "2info"}, #{word: "three", info: "3info"}]
-      endfunc
-      set omnifunc=Omni_test
-      set completeopt+=longest
+    funct Omni_test(findstart, base)
+      if a:findstart
+        return col(".") - 1
+      endif
+      return [#{word: "one", info: "1info"}, #{word: "two", info: "2info"}, #{word: "three", info: "3info"}]
+    endfunc
+    set omnifunc=Omni_test
+    set completeopt+=longest
   END
 
   call writefile(lines, 'Xpreviewscript')
diff --git a/test/old/testdir/test_popup.vim b/test/old/testdir/test_popup.vim
index 56c881b958..5ae2ed5ed5 100644
--- a/test/old/testdir/test_popup.vim
+++ b/test/old/testdir/test_popup.vim
@@ -1178,6 +1178,8 @@ func Test_CompleteChanged()
   set completeopt=menu,menuone
   call feedkeys("i\<C-X>\<C-O>\<BS>\<BS>\<BS>f", 'tx')
   call assert_equal('five', g:word)
+  call feedkeys("i\<C-X>\<C-O>\<BS>\<BS>\<BS>f\<BS>", 'tx')
+  call assert_equal('one', g:word)
 
   autocmd! AAAAA_Group
   set complete& completeopt&