fix deferred calls bug

src/effects.js

@@ -183,7 +183,7 @@ export const render_common_side_effects = (prev, next, command, ui) => {
     next.eval_modules_state != null
   ) {
     const s = next.eval_modules_state
-    s.promise.then(result => {
+    s.promise.__original_then(result => {
       exec('eval_modules_finished', 
         next, /* becomes prev_state */
         result, 

src/eval.js

@@ -362,7 +362,7 @@ export const eval_modules = (
   })
 
   if(is_async) {
-    return result.then(make_result)
+    return result.__original_then(make_result)
   } else {
     return make_result(result)
   }

src/record_io.js

@@ -77,7 +77,7 @@ const io_patch = (path, use_context = false) => {
           : original.apply(this, args)
 
         if(value instanceof cxt.window.Promise) {
-          // TODO use cxt.promise_then, not finally which calls
+          // TODO use __original_then, not finally which calls
           // patched 'then'?
           value = value.finally(() => {
             if(cxt_copy != cxt) {

src/runtime.js

@@ -16,8 +16,7 @@ const gen_to_promise = gen_fn => {
       } else {
         // If promise
         if(result.value?.then != null) {
-          return result.value.then.__original.call(
-            result.value,
+          return result.value.__original_then(
             value => next(gen.next(value)),
             error => next(gen.throw(error)),
           )
@@ -113,6 +112,10 @@ const apply_promise_patch = cxt => {
 
   cxt.promise_then = cxt.window.Promise.prototype.then
 
+  if(cxt.window.Promise.prototype.__original_then == null) {
+    cxt.window.Promise.prototype.__original_then = cxt.window.Promise.prototype.then
+  }
+
   cxt.window.Promise.prototype.then = function then(on_resolve, on_reject) {
 
     if(cxt.children == null) {
@@ -135,14 +138,11 @@ const apply_promise_patch = cxt => {
           }
         }
 
-    return cxt.promise_then.call(
-      this,
+    return this.__original_then(
       make_callback(on_resolve, true),
       make_callback(on_reject, false),
     )
   }
-
-  cxt.window.Promise.prototype.then.__original = cxt.promise_then
 }
 
 const remove_promise_patch = cxt => {
@@ -266,7 +266,7 @@ const __do_await = async (cxt, value) => {
   }
   const children_copy = cxt.children
   if(value instanceof cxt.window.Promise) {
-    cxt.promise_then.call(value,
+    value.__original_then(
       v => {
         value.status = {ok: true, value: v}
       },