vim-patch:8.2.1378: cannot put space between function name and paren

Problem:    Cannot put space between function name and paren.
Solution:   Allow this for backwards compatibility.

bbd3e3c357

This fixes a regression from patch 8.2.1365, which isn't ported yet.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/eval.c

@@ -3149,8 +3149,9 @@ static int eval7(char **arg, typval_T *rettv, evalarg_T *const evalarg, bool wan
       ret = FAIL;
     } else {
       const int flags = evalarg == NULL ? 0 : evalarg->eval_flags;
-      if (**arg == '(') {
+      if (*skipwhite(*arg) == '(') {
         // "name(..."  recursive!
+        *arg = skipwhite(*arg);
         ret = eval_func(arg, evalarg, s, len, rettv, flags, NULL);
       } else if (evaluate) {
         // get value of variable

test/old/testdir/test_expr.vim

@@ -717,6 +717,11 @@ func Test_expr_eval_error()
   call assert_fails("let v = -{}", 'E728:')
 endfunc
 
+func Test_white_in_function_call()
+  let text = substitute ( 'some text' , 't' , 'T' , 'g' )
+  call assert_equal('some TexT', text)
+endfunc
+
 " Test for float value comparison
 func Test_float_compare()
   CheckFeature float