vim-patch:8.2.3520: cannot define a function for thesaurus completion

Problem:    Cannot define a function for thesaurus completion.
Solution:   Add 'thesaurusfunc'. (Yegappan Lakshmanan, closes vim/vim#8987,
            closes 8950)
160e994d76

src/nvim/options.lua

@@ -2535,6 +2535,15 @@ return {
       varname='p_tsr',
       defaults={if_true=""}
     },
+    {
+      full_name='thesaurusfunc', abbreviation='tsrfu',
+      short_desc=N_("function used for thesaurus completion"),
+      type='string', scope={'buffer'},
+      secure=true,
+      alloced=true,
+      varname='p_thsfu',
+      defaults={if_true=""}
+    },
     {
       full_name='tildeop', abbreviation='top',
       short_desc=N_("tilde command \"~\" behaves like an operator"),