FIX: When a user status update received other users statuses were getting cleared (#17520)

app/assets/javascripts/discourse/app/models/user.js

@@ -1238,7 +1238,9 @@ User.reopen(Evented, {
   },
 
   _updateStatus(statuses) {
-    this.set("status", statuses[this.id]);
+    if (statuses.hasOwnProperty(this.id)) {
+      this.set("status", statuses[this.id]);
+    }
   },
 });
 

app/assets/javascripts/discourse/tests/unit/models/user-test.js

@@ -111,4 +111,39 @@ module("Unit | Model | user", function (hooks) {
 
     assert.ok(spyMomentGuess.notCalled);
   });
+
+  test("clears statuses of several users correctly when receiving status updates via appEvents", function (assert) {
+    const status1 = {
+      description: "user1 status",
+      emoji: "mega",
+    };
+    const status2 = {
+      description: "user2 status",
+      emoji: "speech_balloon",
+    };
+    const user1 = User.create({
+      id: 1,
+      status: status1,
+    });
+    const user2 = User.create({ id: 2, status: status2 });
+    const appEvents = user1.appEvents;
+
+    try {
+      user1.trackStatus();
+      user2.trackStatus();
+      assert.equal(user1.status, status1);
+      assert.equal(user2.status, status2);
+
+      appEvents.trigger("user-status:changed", { [user1.id]: null });
+      assert.equal(user1.status, null);
+      assert.equal(user2.status, status2);
+
+      appEvents.trigger("user-status:changed", { [user2.id]: null });
+      assert.equal(user1.status, null);
+      assert.equal(user2.status, null);
+    } finally {
+      user1.stopTrackingStatus();
+      user2.stopTrackingStatus();
+    }
+  });
 });