From 92a3d20682d46359bb50a452b4f831659e799155 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Wed, 31 Aug 2022 16:40:17 +0100
Subject: [PATCH] patch 9.0.0341: mapset() does not restore <Nop> mapping
 properly

Problem:    mapset() does not restore <Nop> mapping properly.
Solution:   Use an empty string for <Nop>. (closes #11022)
---
 src/map.c                          |  5 ++++-
 src/testdir/test_map_functions.vim | 33 ++++++++++++++++++++++++------
 src/version.c                      |  2 ++
 3 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/src/map.c b/src/map.c
index f870b96831..140cbc84f8 100644
--- a/src/map.c
+++ b/src/map.c
@@ -2658,7 +2658,10 @@ f_mapset(typval_T *argvars, typval_T *rettv UNUSED)
 	return;
     }
     orig_rhs = rhs;
-    rhs = replace_termcodes(rhs, &arg_buf,
+    if (STRICMP(rhs, "<nop>") == 0)	// "<Nop>" means nothing
+	rhs = (char_u *)"";
+    else
+	rhs = replace_termcodes(rhs, &arg_buf,
 					REPTERM_DO_LT | REPTERM_SPECIAL, NULL);
 
     noremap = dict_get_number(d, "noremap") ? REMAP_NONE: 0;
diff --git a/src/testdir/test_map_functions.vim b/src/testdir/test_map_functions.vim
index 79321a02f4..5caf668c21 100644
--- a/src/testdir/test_map_functions.vim
+++ b/src/testdir/test_map_functions.vim
@@ -183,11 +183,11 @@ func Test_range_map()
   call assert_equal("abcd", getline(1))
 endfunc
 
-func One_mapset_test(keys)
-  exe 'nnoremap ' .. a:keys .. ' original<CR>'
+func One_mapset_test(keys, rhs)
+  exe 'nnoremap ' .. a:keys .. ' ' .. a:rhs
   let orig = maparg(a:keys, 'n', 0, 1)
   call assert_equal(a:keys, orig.lhs)
-  call assert_equal('original<CR>', orig.rhs)
+  call assert_equal(a:rhs, orig.rhs)
   call assert_equal('n', orig.mode)
 
   exe 'nunmap ' .. a:keys
@@ -197,15 +197,16 @@ func One_mapset_test(keys)
   call mapset('n', 0, orig)
   let d = maparg(a:keys, 'n', 0, 1)
   call assert_equal(a:keys, d.lhs)
-  call assert_equal('original<CR>', d.rhs)
+  call assert_equal(a:rhs, d.rhs)
   call assert_equal('n', d.mode)
 
   exe 'nunmap ' .. a:keys
 endfunc
 
 func Test_mapset()
-  call One_mapset_test('K')
-  call One_mapset_test('<F3>')
+  call One_mapset_test('K', 'original<CR>')
+  call One_mapset_test('<F3>', 'original<CR>')
+  call One_mapset_test('<F3>', '<lt>Nop>')
 
   " Check <> key conversion
   new
@@ -228,6 +229,26 @@ func Test_mapset()
 
   iunmap K
 
+  " Test that <Nop> is restored properly
+  inoremap K <Nop>
+  call feedkeys("SK\<Esc>", 'xt')
+  call assert_equal('', getline(1))
+
+  let orig = maparg('K', 'i', 0, 1)
+  call assert_equal('K', orig.lhs)
+  call assert_equal('<Nop>', orig.rhs)
+  call assert_equal('i', orig.mode)
+
+  inoremap K foo
+  call feedkeys("SK\<Esc>", 'xt')
+  call assert_equal('foo', getline(1))
+
+  call mapset('i', 0, orig)
+  call feedkeys("SK\<Esc>", 'xt')
+  call assert_equal('', getline(1))
+
+  iunmap K
+
   " Test literal <CR> using a backslash
   let cpo_save = &cpo
   set cpo-=B
diff --git a/src/version.c b/src/version.c
index d88688277e..2db1aa65cb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -707,6 +707,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    341,
 /**/
     340,
 /**/