Allow changing NavigationStateManager (#9410)

Unregister old NavigationStateManager before setting new one.

Fixes #9406

diff --git a/server/src/main/java/com/vaadin/navigator/Navigator.java b/server/src/main/java/com/vaadin/navigator/Navigator.java
index 83f1dbe739254bac9f1f4f6662f52b153124323e..567c271211876db6101019e32d41de0f1c8913d8 100644 (file)
--- a/server/src/main/java/com/vaadin/navigator/Navigator.java
+++ b/server/src/main/java/com/vaadin/navigator/Navigator.java
@@ -510,6 +510,10 @@ public class Navigator implements Serializable {
         if (stateManager == null) {
             stateManager = new UriFragmentManager(ui.getPage());
         }
+        if (stateManager != null && this.stateManager != null
+                && stateManager != this.stateManager) {
+            this.stateManager.setNavigator(null);
+        }
         this.stateManager = stateManager;
         this.stateManager.setNavigator(this);
         this.display = display;