vim-patch:9.1.0835: :setglobal doesn't work properly for 'ffu' and 'tsrfu'

Problem:  :setglobal doesn't work properly for 'ffu' and 'tsrfu' when
          the local value is set (after v9.1.0831)
Solution: Check os_flags instead of buffer option variable (zeertzjq).

closes: vim/vim#15980

6eda269600

src/nvim/ex_docmd.c

@@ -5173,7 +5173,7 @@ static Callback *get_findfunc_callback(void)
   return *curbuf->b_p_ffu != NUL ? &curbuf->b_ffu_cb : &ffu_cb;
 }
 
-/// Call 'findfunc' to obtain the list of file names.
+/// Call 'findfunc' to obtain a list of file names.
 static list_T *call_findfunc(char *pat, BoolVarValue cmdcomplete)
 {
   const sctx_T saved_sctx = current_sctx;
@@ -5294,12 +5294,16 @@ const char *did_set_findfunc(optset_T *args)
   buf_T *buf = (buf_T *)args->os_buf;
   int retval;
 
-  if (*buf->b_p_ffu != NUL) {
+  if (args->os_flags & OPT_LOCAL) {
     // buffer-local option set
     retval = option_set_callback_func(buf->b_p_ffu, &buf->b_ffu_cb);
   } else {
     // global option set
     retval = option_set_callback_func(p_ffu, &ffu_cb);
+    // when using :set, free the local callback
+    if (!(args->os_flags & OPT_GLOBAL)) {
+      callback_free(&buf->b_ffu_cb);
+    }
   }
 
   if (retval == FAIL) {

src/nvim/insexpand.c

@@ -2368,13 +2368,13 @@ static void copy_global_to_buflocal_cb(Callback *globcb, Callback *bufcb)
 /// Invoked when the 'completefunc' option is set. The option value can be a
 /// name of a function (string), or function(<name>) or funcref(<name>) or a
 /// lambda expression.
-const char *did_set_completefunc(optset_T *args FUNC_ATTR_UNUSED)
+const char *did_set_completefunc(optset_T *args)
 {
-  if (option_set_callback_func(curbuf->b_p_cfu, &cfu_cb) == FAIL) {
+  buf_T *buf = (buf_T *)args->os_buf;
+  if (option_set_callback_func(buf->b_p_cfu, &cfu_cb) == FAIL) {
     return e_invarg;
   }
-
-  set_buflocal_cfu_callback(curbuf);
+  set_buflocal_cfu_callback(buf);
   return NULL;
 }
 
@@ -2412,14 +2412,19 @@ void set_buflocal_ofu_callback(buf_T *buf)
 /// lambda expression.
 const char *did_set_thesaurusfunc(optset_T *args FUNC_ATTR_UNUSED)
 {
+  buf_T *buf = (buf_T *)args->os_buf;
   int retval;
 
-  if (*curbuf->b_p_tsrfu != NUL) {
+  if (args->os_flags & OPT_LOCAL) {
     // buffer-local option set
-    retval = option_set_callback_func(curbuf->b_p_tsrfu, &curbuf->b_tsrfu_cb);
+    retval = option_set_callback_func(buf->b_p_tsrfu, &buf->b_tsrfu_cb);
   } else {
     // global option set
     retval = option_set_callback_func(p_tsrfu, &tsrfu_cb);
+    // when using :set, free the local callback
+    if (!(args->os_flags & OPT_GLOBAL)) {
+      callback_free(&buf->b_tsrfu_cb);
+    }
   }
 
   return retval == FAIL ? e_invarg : NULL;

test/old/testdir/test_findfile.vim

@@ -364,7 +364,7 @@ func Test_findfunc()
 
   " Error cases
 
-  " Function that doesn't any argument
+  " Function that doesn't take any arguments
   func FindFuncNoArg()
   endfunc
   set findfunc=FindFuncNoArg
@@ -484,6 +484,41 @@ func Test_findfunc_scriptlocal_func()
   call assert_equal('abc', g:FindFuncArg)
   bw!
 
+  new | only
+  set findfunc=
+  setlocal findfunc=NoSuchFunc
+  setglobal findfunc=s:FindFuncScript
+  call assert_equal('NoSuchFunc', &findfunc)
+  call assert_equal('NoSuchFunc', &l:findfunc)
+  call assert_equal(expand('<SID>') .. 'FindFuncScript', &g:findfunc)
+  new | only
+  call assert_equal(expand('<SID>') .. 'FindFuncScript', &findfunc)
+  call assert_equal(expand('<SID>') .. 'FindFuncScript', &g:findfunc)
+  call assert_equal('', &l:findfunc)
+  let g:FindFuncArg = ''
+  find abc
+  call assert_equal('abc', g:FindFuncArg)
+  bw!
+
+  new | only
+  set findfunc=
+  setlocal findfunc=NoSuchFunc
+  set findfunc=s:FindFuncScript
+  call assert_equal(expand('<SID>') .. 'FindFuncScript', &findfunc)
+  call assert_equal(expand('<SID>') .. 'FindFuncScript', &g:findfunc)
+  call assert_equal('', &l:findfunc)
+  let g:FindFuncArg = ''
+  find abc
+  call assert_equal('abc', g:FindFuncArg)
+  new | only
+  call assert_equal(expand('<SID>') .. 'FindFuncScript', &findfunc)
+  call assert_equal(expand('<SID>') .. 'FindFuncScript', &g:findfunc)
+  call assert_equal('', &l:findfunc)
+  let g:FindFuncArg = ''
+  find abc
+  call assert_equal('abc', g:FindFuncArg)
+  bw!
+
   set findfunc=
   delfunc s:FindFuncScript
 endfunc

test/old/testdir/test_ins_complete.vim

@@ -2268,6 +2268,7 @@ func Test_thesaurusfunc_callback()
     call add(g:TsrFunc3Args, [a:findstart, a:base])
     return a:findstart ? 0 : []
   endfunc
+
   set tsrfu=s:TsrFunc3
   new
   call setline(1, 'script1')
@@ -2283,6 +2284,46 @@ func Test_thesaurusfunc_callback()
   call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
   call assert_equal([[1, ''], [0, 'script2']], g:TsrFunc3Args)
   bw!
+
+  new | only
+  set thesaurusfunc=
+  setlocal thesaurusfunc=NoSuchFunc
+  setglobal thesaurusfunc=s:TsrFunc3
+  call assert_equal('NoSuchFunc', &thesaurusfunc)
+  call assert_equal('NoSuchFunc', &l:thesaurusfunc)
+  call assert_equal('s:TsrFunc3', &g:thesaurusfunc)
+  new | only
+  call assert_equal('s:TsrFunc3', &thesaurusfunc)
+  call assert_equal('s:TsrFunc3', &g:thesaurusfunc)
+  call assert_equal('', &l:thesaurusfunc)
+  call setline(1, 'script1')
+  let g:TsrFunc3Args = []
+  call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
+  call assert_equal([[1, ''], [0, 'script1']], g:TsrFunc3Args)
+  bw!
+
+  new | only
+  set thesaurusfunc=
+  setlocal thesaurusfunc=NoSuchFunc
+  set thesaurusfunc=s:TsrFunc3
+  call assert_equal('s:TsrFunc3', &thesaurusfunc)
+  call assert_equal('s:TsrFunc3', &g:thesaurusfunc)
+  call assert_equal('', &l:thesaurusfunc)
+  call setline(1, 'script1')
+  let g:TsrFunc3Args = []
+  call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
+  call assert_equal([[1, ''], [0, 'script1']], g:TsrFunc3Args)
+  setlocal bufhidden=wipe
+  new | only!
+  call assert_equal('s:TsrFunc3', &thesaurusfunc)
+  call assert_equal('s:TsrFunc3', &g:thesaurusfunc)
+  call assert_equal('', &l:thesaurusfunc)
+  call setline(1, 'script1')
+  let g:TsrFunc3Args = []
+  call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
+  call assert_equal([[1, ''], [0, 'script1']], g:TsrFunc3Args)
+  bw!
+
   delfunc s:TsrFunc3
 
   " invalid return value