Re-add body rows when Escalator is reattached to DOM (#20477)

Change-Id: I0ae9144817db3bb730c80748d5e9190484b323e7

# Conflicts:
#	uitest/src/main/java/com/vaadin/tests/widgetset/client/grid/EscalatorBasicClientFeaturesWidget.java

2 files changed, 66 insertions, 0 deletions

diff --git a/uitest/src/main/java/com/vaadin/tests/components/grid/MoveGridAndAddRow.java b/uitest/src/main/java/com/vaadin/tests/components/grid/MoveGridAndAddRow.java
new file mode 100644
index 0000000000..e27c3b5279
--- /dev/null
+++ b/uitest/src/main/java/com/vaadin/tests/components/grid/MoveGridAndAddRow.java
@@ -0,0 +1,45 @@
+package com.vaadin.tests.components.grid;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.vaadin.data.ValueProvider;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUIWithLog;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Grid;
+import com.vaadin.ui.HorizontalLayout;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.VerticalLayout;
+
+public class MoveGridAndAddRow extends AbstractTestUIWithLog {
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        final VerticalLayout layout = new VerticalLayout();
+
+        final VerticalLayout anotherLayout = new VerticalLayout();
+        anotherLayout.addComponent(new Label("This is another layout"));
+        final Grid<String> grid = new Grid<>();
+        grid.addColumn(ValueProvider.identity()).setCaption("A");
+        List<String> items = new ArrayList<>();
+        items.add("1");
+        grid.setItems(items);
+
+        final Button button = new Button("Add row and remove this button");
+        button.setId("add");
+        button.addClickListener(event -> {
+            items.add("2");
+            grid.setItems(items);
+            button.setVisible(false);
+        });
+
+        Button move = new Button("Move grid to other layout");
+        move.setId("move");
+        move.addClickListener(event -> anotherLayout.addComponent(grid));
+
+        layout.addComponents(button, move, grid);
+        addComponent(new HorizontalLayout(layout, anotherLayout));
+
+    }
+}
diff --git a/uitest/src/test/java/com/vaadin/tests/components/grid/MoveGridAndAddRowTest.java b/uitest/src/test/java/com/vaadin/tests/components/grid/MoveGridAndAddRowTest.java
new file mode 100644
index 0000000000..c6d9aa394a
--- /dev/null
+++ b/uitest/src/test/java/com/vaadin/tests/components/grid/MoveGridAndAddRowTest.java
@@ -0,0 +1,21 @@
+package com.vaadin.tests.components.grid;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.vaadin.testbench.elements.ButtonElement;
+import com.vaadin.testbench.elements.GridElement;
+import com.vaadin.tests.tb3.SingleBrowserTest;
+
+public class MoveGridAndAddRowTest extends SingleBrowserTest {
+
+    @Test
+    public void addRowAndChangeLayout() {
+        openTestURL();
+        $(ButtonElement.class).id("add").click();
+
+        GridElement grid = $(GridElement.class).first();
+        Assert.assertEquals("1", grid.getCell(0, 0).getText());
+        Assert.assertEquals("2", grid.getCell(1, 0).getText());
+    }
+}