Fix removing and adding a column in grid (#8437)

* Added column should also be added to footer (#590)

When adding (readding) a column the column should also be
added to footer as it will be removed and iterator will request footer for it.

* Add test for re-add column (#590)

* To lowerCase using Locale

* Fixed compilation problem.
Too little sleep for a friday evening...

server/src/main/java/com/vaadin/ui/Grid.java

@@ -2211,6 +2211,7 @@ public class Grid<T> extends AbstractListing<T> implements HasComponents,
 
         getState().columnOrder.add(identifier);
         getHeader().addColumn(identifier);
+        getFooter().addColumn(identifier);
 
         if (getDefaultHeaderRow() != null) {
             getDefaultHeaderRow().getCell(column).setText(column.getCaption());

uitest/src/main/java/com/vaadin/tests/components/grid/GridColspans.java

@@ -85,7 +85,7 @@ public class GridColspans extends AbstractTestUI {
             if (column != null) {
                 grid.removeColumn(column);
             } else {
-                grid.addColumn(Person::getFirstName).setId("firstName");
+                grid.addColumn(Person::getFirstName).setId("firstName").setCaption("First name");
             }
         }));
 

uitest/src/test/java/com/vaadin/tests/components/grid/GridColspansTest.java

@@ -17,6 +17,7 @@ package com.vaadin.tests.components.grid;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import java.util.Locale;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -56,14 +57,35 @@ public class GridColspansTest extends MultiBrowserTest {
 
         GridElement grid = $(GridElement.class).first();
         assertEquals("Failed initial condition.", "all the stuff",
-                grid.getHeaderCell(0, 1).getText().toLowerCase());
+                grid.getHeaderCell(0, 1).getText().toLowerCase(Locale.ENGLISH));
         assertEquals("Failed initial condition.", "first name",
-                grid.getHeaderCell(2, 1).getText().toLowerCase());
+                grid.getHeaderCell(2, 1).getText().toLowerCase(Locale.ENGLISH));
         $(ButtonElement.class).caption("Show/Hide firstName").first().click();
         assertEquals("Header text changed on column hide.", "all the stuff",
-                grid.getHeaderCell(0, 1).getText().toLowerCase());
+                grid.getHeaderCell(0, 1).getText().toLowerCase(Locale.ENGLISH));
         assertEquals("Failed initial condition.", "last name",
-                grid.getHeaderCell(2, 1).getText().toLowerCase());
+                grid.getHeaderCell(2, 1).getText().toLowerCase(Locale.ENGLISH));
+    }
+
+    @Test
+    public void testHideAndReAddFirstCOlumn() {
+        openTestURL();
+
+        GridElement grid = $(GridElement.class).first();
+
+        assertEquals("Failed initial condition.", "first name",
+                grid.getHeaderCell(2, 1).getText().toLowerCase(Locale.ENGLISH));
+
+        $(ButtonElement.class).caption("Show/Hide firstName").first().click();
+
+        assertEquals("Failed initial condition.", "last name",
+                grid.getHeaderCell(2, 1).getText().toLowerCase(Locale.ENGLISH));
+
+        $(ButtonElement.class).caption("Show/Hide firstName").first().click();
+
+        assertEquals("Failed to find first name in last column", "first name",
+                grid.getHeaderCell(2, 5).getText().toLowerCase(Locale.ENGLISH));
+
     }
 
     @Test
@@ -73,18 +95,18 @@ public class GridColspansTest extends MultiBrowserTest {
         GridElement grid = $(GridElement.class).first();
         GridCellElement headerCell = grid.getHeaderCell(1, 1);
         assertEquals("Failed initial condition.", "full name",
-                headerCell.getText().toLowerCase());
+                headerCell.getText().toLowerCase(Locale.ENGLISH));
         assertEquals("Failed initial condition.", "first name",
-                grid.getHeaderCell(2, 1).getText().toLowerCase());
+                grid.getHeaderCell(2, 1).getText().toLowerCase(Locale.ENGLISH));
         $(ButtonElement.class).get(1).click();
         headerCell = grid.getHeaderCell(1, 1);
         assertEquals("Joined Header text not changed on column reorder.",
-                "misc", headerCell.getText().toLowerCase());
+                "misc", headerCell.getText().toLowerCase(Locale.ENGLISH));
         assertEquals("Unexpected colspan", "1",
                 headerCell.getAttribute("colspan"));
         headerCell = grid.getHeaderCell(1, 2);
         assertEquals("Header text not changed on column reorder", "full name",
-                headerCell.getText().toLowerCase());
+                headerCell.getText().toLowerCase(Locale.ENGLISH));
         assertEquals("Unexpected colspan", "2",
                 headerCell.getAttribute("colspan"));