Allow a resize listener to fire a resize listener (#20338)

Change-Id: I6b045c3a693e88b3cba182ae9ea68cfa98c914b0

1 files changed, 16 insertions, 0 deletions

diff --git a/uitest/src/test/java/com/vaadin/tests/layoutmanager/ConcurrentModificationUITest.java b/uitest/src/test/java/com/vaadin/tests/layoutmanager/ConcurrentModificationUITest.java
new file mode 100644
index 0000000000..4a64fc3173
--- /dev/null
+++ b/uitest/src/test/java/com/vaadin/tests/layoutmanager/ConcurrentModificationUITest.java
@@ -0,0 +1,16 @@
+package com.vaadin.tests.layoutmanager;
+
+import org.junit.Test;
+
+import com.vaadin.tests.tb3.SingleBrowserTest;
+
+public class ConcurrentModificationUITest extends SingleBrowserTest {
+
+    @Test
+    public void noExceptionWhenEnlarging() {
+        testBench().resizeViewPortTo(100, 100);
+        openTestURL("debug");
+        testBench().resizeViewPortTo(200, 200);
+        assertNoErrorNotifications();
+    }
+}