Bug 1755645 - [devtools] Don't unmanage actor if its "old" parent is the same as the "new" one. r=ochameau.

Differential Revision: https://phabricator.services.mozilla.com/D138881

devtools/shared/protocol/Pool.js

@@ -94,10 +94,11 @@ class Pool extends EventEmitter {
       // look at devtools/server/tests/xpcshell/test_addon_reload.js
 
       const parent = actor.getParent();
-      if (parent) {
+      if (parent && parent !== this) {
         parent.unmanage(actor);
       }
     }
+
     this._poolMap.set(actor.actorID, actor);
     actor.parentPool = this;
   }