Only remove caption margin from the first visible tab. (#12078)

Fixes #10437

1 files changed, 43 insertions, 0 deletions

diff --git a/uitest/src/main/java/com/vaadin/tests/components/tabsheet/TabNotVisibleInTheMiddleOfTabsheet.java b/uitest/src/main/java/com/vaadin/tests/components/tabsheet/TabNotVisibleInTheMiddleOfTabsheet.java
new file mode 100644
index 0000000000..cb65e4cd21
--- /dev/null
+++ b/uitest/src/main/java/com/vaadin/tests/components/tabsheet/TabNotVisibleInTheMiddleOfTabsheet.java
@@ -0,0 +1,43 @@
+package com.vaadin.tests.components.tabsheet;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.TabSheet;
+import com.vaadin.ui.VerticalLayout;
+
+public class TabNotVisibleInTheMiddleOfTabsheet extends AbstractTestUI {
+
+    private TabSheet.Tab secondTab;
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        TabSheet tabSheet = new TabSheet();
+        tabSheet.setWidth("600px");
+
+        tabSheet.addTab(new Label("first visible tab"), "first visible tab");
+
+        secondTab = tabSheet.addTab(new Label("second visible tab"),
+                "second visible tab");
+
+        for (int i = 3; i < 10; i++) {
+            tabSheet.addTab(new Label("visible tab " + i), "visible tab " + i);
+        }
+
+        addComponent(new VerticalLayout(tabSheet, new Button(
+                "Toggle second tab",
+                event -> secondTab.setVisible(!secondTab.isVisible()))));
+    }
+
+    @Override
+    protected Integer getTicketNumber() {
+        return 10437;
+    }
+
+    @Override
+    protected String getTestDescription() {
+        return "First and third tab should have the usual gap "
+                + "between them when second tab gets hidden.";
+    }
+}