vim-patch:8.1.1832: win_execute() does not work in other tab

Problem:    Win_execute() does not work in other tab. (Rick Howe)
Solution:   Take care of the tab. (closes vim/vim#4792)
820680b9ff

src/nvim/window.c

@@ -6820,11 +6820,20 @@ void win_id2tabwin(typval_T *const argvars, typval_T *const rettv)
 }
 
 win_T * win_id2wp(typval_T *argvars)
+{
+  return win_id2wp_tp(argvars, NULL);
+}
+
+// Return the window and tab pointer of window "id".
+win_T * win_id2wp_tp(typval_T *argvars, tabpage_T **tpp)
 {
   int id = tv_get_number(&argvars[0]);
 
   FOR_ALL_TAB_WINDOWS(tp, wp) {
     if (wp->handle == id) {
+      if (tpp != NULL) {
+        *tpp = tp;
+      }
       return wp;
     }
   }