diff --git a/src/nvim/buffer_defs.h b/src/nvim/buffer_defs.h
index f9f8a183ab..cf1131ee19 100644
--- a/src/nvim/buffer_defs.h
+++ b/src/nvim/buffer_defs.h
@@ -211,6 +211,18 @@ typedef struct {
   OptInt wo_winbl;
 #define w_p_winbl w_onebuf_opt.wo_winbl  // 'winblend'
 
+  // A few options have local flags for kOptFlagInsecure.
+  uint32_t wo_wrap_flags;               // flags for 'wrap'
+#define w_p_wrap_flags w_onebuf_opt.wo_wrap_flags
+  uint32_t wo_stl_flags;                // flags for 'statusline'
+#define w_p_stl_flags w_onebuf_opt.wo_stl_flags
+  uint32_t wo_wbr_flags;                // flags for 'winbar'
+#define w_p_wbr_flags w_onebuf_opt.wo_wbr_flags
+  uint32_t wo_fde_flags;                // flags for 'foldexpr'
+#define w_p_fde_flags w_onebuf_opt.wo_fde_flags
+  uint32_t wo_fdt_flags;                // flags for 'foldtext'
+#define w_p_fdt_flags w_onebuf_opt.wo_fdt_flags
+
   sctx_T wo_script_ctx[kWinOptCount];  // SCTXs for window-local options
 #define w_p_script_ctx w_onebuf_opt.wo_script_ctx
 } winopt_T;
@@ -1302,12 +1314,6 @@ struct window_S {
   // transform a pointer to a "onebuf" option into a "allbuf" option
 #define GLOBAL_WO(p)    ((char *)(p) + sizeof(winopt_T))
 
-  // A few options have local flags for kOptFlagInsecure.
-  uint32_t w_p_wrap_flags;          // flags for 'wrap'
-  uint32_t w_p_stl_flags;           // flags for 'statusline'
-  uint32_t w_p_wbr_flags;           // flags for 'winbar'
-  uint32_t w_p_fde_flags;           // flags for 'foldexpr'
-  uint32_t w_p_fdt_flags;           // flags for 'foldtext'
   int *w_p_cc_cols;                 // array of columns to highlight or NULL
   uint8_t w_p_culopt_flags;         // flags for cursorline highlighting
 
diff --git a/src/nvim/option.c b/src/nvim/option.c
index 3e6de605f2..0edc393e76 100644
--- a/src/nvim/option.c
+++ b/src/nvim/option.c
@@ -487,6 +487,7 @@ static void change_option_default(const OptIndex opt_idx, OptVal value)
 /// @param  opt_flags  Option flags (can be OPT_LOCAL, OPT_GLOBAL or a combination).
 static void set_option_default(const OptIndex opt_idx, int opt_flags)
 {
+  bool both = (opt_flags & (OPT_LOCAL | OPT_GLOBAL)) == 0;
   OptVal def_val = get_option_default(opt_idx, opt_flags);
   set_option_direct(opt_idx, def_val, opt_flags, current_sctx.sc_sid);
 
@@ -497,6 +498,10 @@ static void set_option_default(const OptIndex opt_idx, int opt_flags)
   // The default value is not insecure.
   uint32_t *flagsp = insecure_flag(curwin, opt_idx, opt_flags);
   *flagsp = *flagsp & ~(unsigned)kOptFlagInsecure;
+  if (both) {
+    flagsp = insecure_flag(curwin, opt_idx, OPT_LOCAL);
+    *flagsp = *flagsp & ~(unsigned)kOptFlagInsecure;
+  }
 }
 
 /// Set all options (except terminal options) to their default value.
@@ -1663,6 +1668,18 @@ uint32_t *insecure_flag(win_T *const wp, OptIndex opt_idx, int opt_flags)
     default:
       break;
     }
+  } else {
+    // For global value of window-local options, use flags in w_allbuf_opt.
+    switch (opt_idx) {
+    case kOptWrap:
+      return &wp->w_allbuf_opt.wo_wrap_flags;
+    case kOptFoldexpr:
+      return &wp->w_allbuf_opt.wo_fde_flags;
+    case kOptFoldtext:
+      return &wp->w_allbuf_opt.wo_fdt_flags;
+    default:
+      break;
+    }
   }
   // Nothing special, return global flags field.
   return &options[opt_idx].flags;
@@ -3555,15 +3572,22 @@ static const char *did_set_option(OptIndex opt_idx, void *varp, OptVal old_value
   check_redraw(opt->flags);
 
   if (errmsg == NULL) {
-    uint32_t *p = insecure_flag(curwin, opt_idx, opt_flags);
     opt->flags |= kOptFlagWasSet;
 
-    // When an option is set in the sandbox, from a modeline or in secure mode set the kOptFlagInsecure
-    // flag.  Otherwise, if a new value is stored reset the flag.
+    uint32_t *flagsp = insecure_flag(curwin, opt_idx, opt_flags);
+    uint32_t *flagsp_local = scope_both ? insecure_flag(curwin, opt_idx, OPT_LOCAL) : NULL;
+    // When an option is set in the sandbox, from a modeline or in secure mode set the
+    // kOptFlagInsecure flag.  Otherwise, if a new value is stored reset the flag.
     if (!value_checked && (secure || sandbox != 0 || (opt_flags & OPT_MODELINE))) {
-      *p |= kOptFlagInsecure;
+      *flagsp |= kOptFlagInsecure;
+      if (flagsp_local != NULL) {
+        *flagsp_local |= kOptFlagInsecure;
+      }
     } else if (value_replaced) {
-      *p &= ~(unsigned)kOptFlagInsecure;
+      *flagsp &= ~(unsigned)kOptFlagInsecure;
+      if (flagsp_local != NULL) {
+        *flagsp_local &= ~(unsigned)kOptFlagInsecure;
+      }
     }
   }
 
@@ -4913,6 +4937,12 @@ void copy_winopt(winopt_T *from, winopt_T *to)
   to->wo_winbl = from->wo_winbl;
   to->wo_stc = copy_option_val(from->wo_stc);
 
+  to->wo_wrap_flags = from->wo_wrap_flags;
+  to->wo_stl_flags = from->wo_stl_flags;
+  to->wo_wbr_flags = from->wo_wbr_flags;
+  to->wo_fde_flags = from->wo_fde_flags;
+  to->wo_fdt_flags = from->wo_fdt_flags;
+
   // Copy the script context so that we know were the value was last set.
   memmove(to->wo_script_ctx, from->wo_script_ctx, sizeof(to->wo_script_ctx));
   check_winopt(to);             // don't want NULL pointers
diff --git a/test/old/testdir/test_fold.vim b/test/old/testdir/test_fold.vim
index 6569e032f6..756cab15ed 100644
--- a/test/old/testdir/test_fold.vim
+++ b/test/old/testdir/test_fold.vim
@@ -1499,7 +1499,7 @@ endfunc
 " in a sandbox
 func Test_foldtext_in_modeline()
   func ModelineFoldText()
-    call feedkeys('aFoo', 'xt')
+    call writefile(['after'], 'Xmodelinefoldtext_write')
     return "folded text"
   endfunc
   let lines =<< trim END
@@ -1510,24 +1510,78 @@ func Test_foldtext_in_modeline()
   END
   call writefile(lines, 'Xmodelinefoldtext', 'D')
 
+  func Check_foldtext_in_modeline(set_cmd)
+    call writefile(['before'], 'Xmodelinefoldtext_write', 'D')
+    split Xmodelinefoldtext
+    call cursor(1, 1)
+    normal! zf3j
+    call assert_equal('folded text', foldtextresult(1))
+    call assert_equal(['before'], readfile('Xmodelinefoldtext_write'))
+
+    split
+    call assert_equal('folded text', foldtextresult(1))
+    call assert_equal(['before'], readfile('Xmodelinefoldtext_write'))
+    close
+
+    setglobal foldtext=ModelineFoldText()
+    call assert_equal('folded text', foldtextresult(1))
+    call assert_equal(['before'], readfile('Xmodelinefoldtext_write'))
+
+    setglobal foldtext&
+    call assert_equal('folded text', foldtextresult(1))
+    call assert_equal(['before'], readfile('Xmodelinefoldtext_write'))
+
+    exe a:set_cmd 'foldtext=ModelineFoldText()'
+    call assert_equal('folded text', foldtextresult(1))
+    call assert_equal(['after'], readfile('Xmodelinefoldtext_write'))
+
+    call writefile(['before'], 'Xmodelinefoldtext_write')
+    exe 'sandbox' a:set_cmd 'foldtext=ModelineFoldText()'
+    call assert_equal('folded text', foldtextresult(1))
+    call assert_equal(['before'], readfile('Xmodelinefoldtext_write'))
+
+    exe a:set_cmd 'foldtext=ModelineFoldText()'
+    call assert_equal('folded text', foldtextresult(1))
+    call assert_equal(['after'], readfile('Xmodelinefoldtext_write'))
+    bw!
+  endfunc
+
   set modeline modelineexpr
-  split Xmodelinefoldtext
+  call Check_foldtext_in_modeline('setlocal')
+  call Check_foldtext_in_modeline('set')
 
-  call cursor(1, 1)
-  normal! zf3j
+  new Xa
+  sandbox setglobal foldenable foldtext=ModelineFoldText()
+  setlocal bufhidden=wipe
+  call writefile(['before'], 'Xmodelinefoldtext_write', 'D')
+  edit! Xb
+  call setline(1, ['func T()', '  let i = 1', 'endfunc']) | %fold
   call assert_equal('folded text', foldtextresult(1))
-  call assert_equal(lines, getbufline('', 1, '$'))
+  call assert_equal(['before'], readfile('Xmodelinefoldtext_write'))
+  setglobal foldtext=ModelineFoldText()
+  call assert_equal('folded text', foldtextresult(1))
+  call assert_equal(['before'], readfile('Xmodelinefoldtext_write'))
+  setlocal foldtext=ModelineFoldText()
+  call assert_equal('folded text', foldtextresult(1))
+  call assert_equal(['after'], readfile('Xmodelinefoldtext_write'))
+  setlocal bufhidden=wipe
+  call writefile(['before'], 'Xmodelinefoldtext_write', 'D')
+  edit! Xc
+  call setline(1, ['func T()', '  let i = 1', 'endfunc']) | %fold
+  call assert_equal('folded text', foldtextresult(1))
+  call assert_equal(['after'], readfile('Xmodelinefoldtext_write'))
+  bwipe!
 
-  bw!
   set modeline& modelineexpr&
   delfunc ModelineFoldText
+  delfunc Check_foldtext_in_modeline
 endfunc
 
 " Test for setting 'foldexpr' from the modeline and executing the expression
 " in a sandbox
 func Test_foldexpr_in_modeline()
   func ModelineFoldExpr()
-    call feedkeys('aFoo', 'xt')
+    call writefile(['after'], 'Xmodelinefoldexpr_write')
     return strlen(matchstr(getline(v:lnum),'^\s*'))
   endfunc
   let lines =<< trim END
@@ -1541,15 +1595,69 @@ func Test_foldexpr_in_modeline()
   END
   call writefile(lines, 'Xmodelinefoldexpr', 'D')
 
+  func Check_foldexpr_in_modeline(set_cmd)
+    call writefile(['before'], 'Xmodelinefoldexpr_write', 'D')
+    split Xmodelinefoldexpr
+    call assert_equal(2, foldlevel(3))
+    call assert_equal(['before'], readfile('Xmodelinefoldexpr_write'))
+
+    split
+    call assert_equal(2, foldlevel(3))
+    call assert_equal(['before'], readfile('Xmodelinefoldexpr_write'))
+    close
+
+    setglobal foldexpr=ModelineFoldExpr()
+    call assert_equal(2, foldlevel(3))
+    call assert_equal(['before'], readfile('Xmodelinefoldexpr_write'))
+
+    setglobal foldexpr&
+    call assert_equal(2, foldlevel(3))
+    call assert_equal(['before'], readfile('Xmodelinefoldexpr_write'))
+
+    exe a:set_cmd 'foldexpr=ModelineFoldExpr()'
+    call assert_equal(2, foldlevel(3))
+    call assert_equal(['after'], readfile('Xmodelinefoldexpr_write'))
+
+    call writefile(['before'], 'Xmodelinefoldexpr_write')
+    exe 'sandbox' a:set_cmd 'foldexpr=ModelineFoldExpr()'
+    call assert_equal(2, foldlevel(3))
+    call assert_equal(['before'], readfile('Xmodelinefoldexpr_write'))
+
+    exe a:set_cmd 'foldexpr=ModelineFoldExpr()'
+    call assert_equal(2, foldlevel(3))
+    call assert_equal(['after'], readfile('Xmodelinefoldexpr_write'))
+    bw!
+  endfunc
+
   set modeline modelineexpr
-  split Xmodelinefoldexpr
+  call Check_foldexpr_in_modeline('setlocal')
+  call Check_foldexpr_in_modeline('set')
 
+  new Xa
+  sandbox setglobal foldenable foldmethod=expr foldexpr=ModelineFoldExpr()
+  setlocal bufhidden=wipe
+  call writefile(['before'], 'Xmodelinefoldexpr_write', 'D')
+  edit! Xb
+  call setline(1, lines[0:5])
   call assert_equal(2, foldlevel(3))
-  call assert_equal(lines, getbufline('', 1, '$'))
+  call assert_equal(['before'], readfile('Xmodelinefoldexpr_write'))
+  setglobal foldexpr=ModelineFoldExpr()
+  call assert_equal(2, foldlevel(3))
+  call assert_equal(['before'], readfile('Xmodelinefoldexpr_write'))
+  setlocal foldexpr=ModelineFoldExpr()
+  call assert_equal(2, foldlevel(3))
+  call assert_equal(['after'], readfile('Xmodelinefoldexpr_write'))
+  setlocal bufhidden=wipe
+  call writefile(['before'], 'Xmodelinefoldexpr_write', 'D')
+  edit! Xc
+  call setline(1, lines[0:5])
+  call assert_equal(2, foldlevel(3))
+  call assert_equal(['after'], readfile('Xmodelinefoldexpr_write'))
+  bwipe!
 
-  bw!
   set modeline& modelineexpr&
   delfunc ModelineFoldExpr
+  delfunc Check_foldexpr_in_modeline
 endfunc
 
 " Make sure a fold containing a nested fold is split correctly when using
diff --git a/test/old/testdir/test_modeline.vim b/test/old/testdir/test_modeline.vim
index a1050f82cb..628c4770db 100644
--- a/test/old/testdir/test_modeline.vim
+++ b/test/old/testdir/test_modeline.vim
@@ -382,10 +382,40 @@ func Test_modeline_nowrap_lcs_extends()
         \ 'ccc                    evil',
         \ 'ddd                    vim: nowrap',
         \ ], 'Xmodeline_nowrap', 'D')
-  call NewWindow(10, 20)
+  set noequalalways
+  11new | 20vsplit
+
+  func Check_modeline_nowrap(expect_insecure, expect_secure, set_cmd)
+    edit Xmodeline_nowrap
+    call assert_equal(a:expect_insecure, ScreenLines([1, 5], 20))
+
+    5split
+    call assert_equal(a:expect_insecure, ScreenLines([1, 5], 20))
+    call assert_equal(a:expect_insecure, ScreenLines([7, 11], 20))
+
+    exe a:set_cmd 'nowrap'
+    call assert_equal(a:expect_secure, ScreenLines([1, 5], 20))
+    call assert_equal(a:expect_insecure, ScreenLines([7, 11], 20))
+
+    close
+    call assert_equal(a:expect_insecure, ScreenLines([1, 5], 20))
+
+    setglobal nowrap
+    call assert_equal(a:expect_insecure, ScreenLines([1, 5], 20))
+    setglobal wrap
+    call assert_equal(a:expect_insecure, ScreenLines([1, 5], 20))
+
+    exe a:set_cmd 'nowrap'
+    call assert_equal(a:expect_secure, ScreenLines([1, 5], 20))
+
+    exe 'sandbox' a:set_cmd 'nowrap'
+    call assert_equal(a:expect_insecure, ScreenLines([1, 5], 20))
+
+    exe a:set_cmd 'nowrap'
+    call assert_equal(a:expect_secure, ScreenLines([1, 5], 20))
+  endfunc
 
   setlocal nolist listchars=
-  edit Xmodeline_nowrap
   let expect_insecure = [
         \ 'aaa                 ',
         \ 'bbb                 ',
@@ -393,9 +423,6 @@ func Test_modeline_nowrap_lcs_extends()
         \ 'ddd                >',
         \ '~                   ',
         \ ]
-  call assert_equal(expect_insecure, ScreenLines([1, 5], 20))
-
-  setlocal nowrap
   let expect_secure = [
         \ 'aaa                 ',
         \ 'bbb                 ',
@@ -403,7 +430,8 @@ func Test_modeline_nowrap_lcs_extends()
         \ 'ddd                 ',
         \ '~                   ',
         \ ]
-  call assert_equal(expect_secure, ScreenLines([1, 5], 20))
+  call Check_modeline_nowrap(expect_insecure, expect_secure, 'setlocal')
+  call Check_modeline_nowrap(expect_insecure, expect_secure, 'set')
 
   setlocal list listchars=extends:+
   let expect_secure = [
@@ -414,13 +442,65 @@ func Test_modeline_nowrap_lcs_extends()
         \ '~                   ',
         \ ]
   call assert_equal(expect_secure, ScreenLines([1, 5], 20))
+  call Check_modeline_nowrap(expect_insecure, expect_secure, 'setlocal')
+  call Check_modeline_nowrap(expect_insecure, expect_secure, 'set')
 
-  edit Xmodeline_nowrap
-  call assert_equal(expect_insecure, ScreenLines([1, 5], 20))
+  " Other 'listchars' flags are not affected.
+  call writefile([
+        \ "aa\ta",
+        \ "bb\tb",
+        \ "cc\tc              evil",
+        \ "dd\td              vim: nowrap lcs=tab\\:<->",
+        \ ], 'Xmodeline_nowrap')
+  let expect_insecure = [
+        \ 'aa<---->a           ',
+        \ 'bb<---->b           ',
+        \ 'cc<---->c          >',
+        \ 'dd<---->d          >',
+        \ '~                   ',
+        \ ]
+  let expect_secure = [
+        \ 'aa<---->a           ',
+        \ 'bb<---->b           ',
+        \ 'cc<---->c           ',
+        \ 'dd<---->d           ',
+        \ '~                   ',
+        \ ]
+  call Check_modeline_nowrap(expect_insecure, expect_secure, 'setlocal')
+  call Check_modeline_nowrap(expect_insecure, expect_secure, 'set')
+
+  " Same behavior even if modeline sets "extends" to a space.
+  call writefile([
+        \ "aa\ta",
+        \ "bb\tb",
+        \ "cc\tc              evil",
+        \ "dd\td              vim: nowrap lcs=tab\\:<->",
+        \ ], 'Xmodeline_nowrap')
+  call Check_modeline_nowrap(expect_insecure, expect_secure, 'setlocal')
+  call Check_modeline_nowrap(expect_insecure, expect_secure, 'set')
+
+  sandbox setglobal nowrap
+  setglobal list listchars=eol:$
+  setlocal bufhidden=wipe
+  enew!
+  call setline(1, ['aaa                    bbb'])
+  call assert_equal(['aaa                >'], ScreenLines(1, 20))
+  setglobal nowrap
+  call assert_equal(['aaa                >'], ScreenLines(1, 20))
   setlocal nowrap
-  call assert_equal(expect_secure, ScreenLines([1, 5], 20))
+  call assert_equal(['aaa                 '], ScreenLines(1, 20))
+  normal! 20zl
+  call assert_equal(['   bbb$             '], ScreenLines(1, 20))
+  setlocal bufhidden=wipe
+  enew!
+  call setline(1, ['ccc                    ddd'])
+  call assert_equal(['ccc                 '], ScreenLines(1, 20))
+  normal! 20zl
+  call assert_equal(['   ddd$             '], ScreenLines(1, 20))
 
-  call CloseWindow()
+  bwipe!
+  delfunc Check_modeline_nowrap
+  set equalalways&
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/test/old/testdir/test_statusline.vim b/test/old/testdir/test_statusline.vim
index bd2c596b57..6886700e83 100644
--- a/test/old/testdir/test_statusline.vim
+++ b/test/old/testdir/test_statusline.vim
@@ -641,4 +641,67 @@ func Test_statusline_highlight_group_cleared()
   call StopVimInTerminal(buf)
 endfunc
 
+" Test for setting both global and local 'statusline' values in a sandbox
+func Test_statusline_in_sandbox()
+  func SandboxStatusLine()
+    call writefile(['after'], 'Xsandboxstatusline_write')
+    return "status line"
+  endfunc
+
+  func Check_statusline_in_sandbox(set_cmd0, set_cmd1)
+    only
+    11new | 20vsplit
+    call setline(1, 'foo')
+    windo setlocal statusline=SomethingElse
+    wincmd t
+    setlocal statusline=
+    call writefile(['before'], 'Xsandboxstatusline_write', 'D')
+
+    exe 'sandbox' a:set_cmd0 'statusline=%!SandboxStatusLine()'
+    call assert_equal('', &l:statusline)
+    sandbox setlocal statusline=%!SandboxStatusLine()
+    call assert_fails('redrawstatus', 'E48:')
+    call assert_equal(['before'], readfile('Xsandboxstatusline_write'))
+    wincmd b
+    call assert_fails('redrawstatus!', 'E48:')
+    call assert_equal(['before'], readfile('Xsandboxstatusline_write'))
+    wincmd t
+
+    5split
+    call assert_fails('redrawstatus!', 'E48:')
+    call assert_equal(['before'], readfile('Xsandboxstatusline_write'))
+    close
+
+    setlocal statusline=%!SandboxStatusLine() | redrawstatus
+    call assert_equal('status line', Screenline(12))
+    call assert_equal(['after'], readfile('Xsandboxstatusline_write'))
+
+    call writefile(['before'], 'Xsandboxstatusline_write')
+    setlocal statusline=
+    call assert_fails('redrawstatus', 'E48:')
+    call assert_equal(['before'], readfile('Xsandboxstatusline_write'))
+
+    5split
+    call assert_fails('redrawstatus!', 'E48:')
+    call assert_equal(['before'], readfile('Xsandboxstatusline_write'))
+
+    exe a:set_cmd1 'statusline=%!SandboxStatusLine()' | redrawstatus!
+    call assert_equal('', &l:statusline)
+    call assert_equal('status line', Screenline(6))
+    call assert_equal('status line', Screenline(12))
+    call assert_equal(['after'], readfile('Xsandboxstatusline_write'))
+    bwipe!
+  endfunc
+
+  set noequalalways
+  call Check_statusline_in_sandbox('setglobal', 'setglobal')
+  call Check_statusline_in_sandbox('setglobal', 'set')
+  call Check_statusline_in_sandbox('set', 'setglobal')
+  call Check_statusline_in_sandbox('set', 'set')
+
+  set equalalways& statusline&
+  delfunc SandboxStatusLine
+  delfunc Check_statusline_in_sandbox
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab