Fix Observation notification not triggering on nested properties

RealmSwift/Projection.swift

@@ -321,7 +321,7 @@ extension ProjectionObservable {
 
             var projectedChanges = [PropertyChange]()
             for i in 0..<newValues.count {
-                for property in schema.filter({ $0.originPropertyKeyPathString == names[i] }) {
+                for property in schema.filter({ $0.originPropertyKeyPathString.components(separatedBy: ".").dropLast().joined(separator: "") == names[i] }) {
                     var changeOldValue: Any?
                     if oldValues != nil {
                         changeOldValue = unmanagedRoot![keyPath: property.projectedKeyPath]

RealmSwift/Tests/ProjectionTests.swift

@@ -945,6 +945,27 @@ class ProjectionTests: TestCase {
         token.invalidate()
     }
 
+    func testObserveNestedProjection() {
+        let realm = populatedRealm()
+        let johnProjection = realm.objects(PersonProjection.self).first!
+
+        let ex = expectation(description: "testProjectionNotification")
+        let token = johnProjection.observe { changes in
+            if case .change(_, _) = changes {
+                ex.fulfill()
+            } else {
+                XCTFail("expected .change, got \(changes)")
+            }
+
+        }
+        try! realm.write {
+            let johnObject = realm.objects(CommonPerson.self).filter("lastName == 'Snow'").first!
+            johnObject.address?.city = "Barranquilla"
+        }
+        waitForExpectations(timeout: 1000.0, handler: nil)
+        token.invalidate()
+    }
+
     var changeDictionary: [NSKeyValueChangeKey: Any]?
     override func observeValue(forKeyPath keyPath: String?, of object: Any?,
                                change: [NSKeyValueChangeKey: Any]?,