Bug 1565010 - Fix intermittent on browser_webconsole_warn_about_replaced_api.js .r=Honza.

Log the console replaced message only after the current batch of messages are consumed.
We also enable the timestamp in the test, so in case of failure we can diagnose
what's going on better.

Differential Revision: https://phabricator.services.mozilla.com/D72121

UltraBlame original commit: d321839de1603d8bf02752ebaa40434015149320

Author: marco-c

devtools/client/webconsole/test/browser/browser_webconsole_warn_about_replaced_api.js

@@ -9,9 +9,8 @@ const TEST_URI_NOT_REPLACED =
   "data:text/html;charset=utf8,<script>console.log('foo')</script>";
 
 add_task(async function() {
-  await SpecialPowers.pushPrefEnv({
-    set: [["devtools.webconsole.persistlog", true]],
-  });
+  await pushPref("devtools.webconsole.timestampMessages", true);
+  await pushPref("devtools.webconsole.persistlog", true);
 
   let hud = await openNewTabAndConsole(TEST_URI_NOT_REPLACED);
 

devtools/client/webconsole/webconsole-ui.js

@@ -589,13 +589,14 @@ class WebConsoleUI {
 
 
   async handleTabNavigated(packet) {
+    
+    
+    await this.wrapper.waitAsyncDispatches();
+
     if (!packet.nativeConsoleAPI) {
       this.logWarningAboutReplacedAPI();
     }
 
-    
-    
-    await this.wrapper.waitAsyncDispatches();
     this.emit("reloaded");
   }