Fix the entry settings object for promise callbacks

Closes #1426.

source

@@ -3008,6 +3008,8 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-objectcreate">ObjectCreate</dfn> abstract operation</li>
      <li>The <dfn data-x="js-ParseModule" data-x-href="https://tc39.es/ecma262/#sec-parsemodule">ParseModule</dfn> abstract operation</li>
      <li>The <dfn data-x="js-ParseScript" data-x-href="https://tc39.es/ecma262/#sec-parse-script">ParseScript</dfn> abstract operation</li>
+     <li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-promisereactionjob">PromiseReactionJob</dfn> abstract operation</li>
+     <li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-promiseresolvethenablejob">PromiseResolveThenableJob</dfn> abstract operation</li>
      <li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-regexpbuiltinexec">RegExpBuiltinExec</dfn> abstract operation</li>
      <li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-regexpcreate">RegExpCreate</dfn> abstract operation</li>
      <li>The <dfn data-x-href="https://tc39.es/ecma262/#sec-runjobs">RunJobs</dfn> abstract operation</li>
@@ -91021,15 +91023,32 @@ document.querySelector("button").addEventListener("click", bound);
    <li><p>Assert: <var>queueName</var> is <code data-x="">"PromiseJobs"</code>. (<code
    data-x="">"ScriptJobs"</code> must not be used by user agents.)</p></li>
 
+   <li><p>Assert: <var>job</var> is either <span>PromiseResolveThenableJob</span> or
+   <span>PromiseReactionJob</span>. (The following steps would need to be updated if another type of
+   promise job were introduced.)</p></li>
+
    <li>
-    <p>Let <var>job settings</var> be some appropriate <span>environment settings object</span>.</p>
+    <p>Let <var>job settings</var> be determined by switching on <var>job</var>:</p>
+
+    <dl class="switch">
+     <dt><span>PromiseResolveThenableJob</span></dt>
+     <dd>
+      <p>The <span data-x="concept-realm-settings-object">settings object</span> for
+      <var>arguments</var>[2].[[Realm]]. (I.e., the <span data-x="JavaScript realm">Realm</span> of
+      the <code data-x="">then</code> function.)</p>
+     </dd>
 
-    <p class="warning">It is not yet clear how to specify the <span>environment settings
-    object</span> that should be used here. In practice, this means that the <span
-    data-x="concept-entry-everything">entry</span> concept is not correctly specified while
-    executing a job. See <a
-    href="https://github.com/whatwg/html/pull/1189#issuecomment-224950188">discussion in issue
-    #1189</a>.</p>
+     <dt><span>PromiseReactionJob</span></dt>
+     <dd>
+      <p>If <var>arguments</var>[0].[[Handler]] is not undefined, then the <span
+      data-x="concept-realm-settings-object">settings object</span> of
+      <var>arguments</var>[0].[[Handler]].[[Realm]]; otherwise, null.</p>
+
+      <p class="note">If the handler is undefined, then we are in a case like <code
+      data-x="">promise.then(null, null)</code>. In this case, no author code will run, so all of
+      the steps below that would otherwise use <var>job settings</var> get skipped.</p>
+     </dd>
+    </dl>
    </li>
 
    <li><p>Let <var>incumbent settings</var> be the <span>incumbent settings object</span>.</p></li>
@@ -91084,15 +91103,16 @@ document.querySelector("button").addEventListener("click", bound);
    </li>
 
    <li>
-    <p><span>Queue a microtask</span>, on <var>job settings</var>'s <span>responsible event
-    loop</span>, to perform the following steps:</p>
+    <p><span>Queue a microtask</span> on the <span>surrounding agent</span>'s <span>event
+    loop</span> to perform the following steps:</p>
 
     <ol>
-     <li><p><span>Check if we can run script</span> with <var>job settings</var>. If this returns
-     "do not run" then return.</p></li>
+     <li><p>If <var>job settings</var> is not null, then <span>check if we can run script</span>
+     with <var>job settings</var>. If this returns "do not run" then return.</p></li>
 
      <li>
-      <p><span>Prepare to run script</span> with <var>job settings</var>.</p>
+      <p>If <var>job settings</var> is not null, then <span>prepare to run script</span> with
+      <var>job settings</var>.</p>
 
       <p class="note">This affects the <span data-x="concept-entry-everything">entry</span> concept
       while the job runs.</p>
@@ -91124,7 +91144,8 @@ document.querySelector("button").addEventListener("click", bound);
      <li><p><span>Clean up after running a callback</span> with <var>incumbent
      settings</var>.</p></li>
 
-     <li><p><span>Clean up after running script</span> with <var>job settings</var>.</p></li>
+     <li><p>If <var>job settings</var> is not null, then <span>clean up after running script</span>
+     with <var>job settings</var>.</p></li>
 
      <li><p>If <var>result</var> is an <span>abrupt completion</span>, then <span>report the
      exception</span> given by <var>result</var>.[[Value]].</p></li>