Check actual Grid selection instead of relying on allSelected flag. (#11787)

The checkbox for selecting all rows only selects all the rows that have
not been filtered out. Changing the filtering does not change the
selection or the checkbox state so assuming that all rows are selected
simply because the checkbox has been checked cannot work.

Fixes #11479

client/src/main/java/com/vaadin/client/connectors/grid/MultiSelectionModelConnector.java

@@ -250,7 +250,7 @@ public class MultiSelectionModelConnector
 
     @Override
     protected boolean isSelected(JsonObject item) {
-        return getState().allSelected || super.isSelected(item);
+        return super.isSelected(item);
     }
 
     /**

server/src/main/java/com/vaadin/ui/components/grid/MultiSelectionModelImpl.java

@@ -15,7 +15,24 @@
  */
 package com.vaadin.ui.components.grid;
 
-import com.vaadin.data.provider.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import com.vaadin.data.provider.DataCommunicator;
+import com.vaadin.data.provider.DataProvider;
+import com.vaadin.data.provider.HierarchicalDataProvider;
+import com.vaadin.data.provider.HierarchicalQuery;
+import com.vaadin.data.provider.Query;
 import com.vaadin.event.selection.MultiSelectionEvent;
 import com.vaadin.event.selection.MultiSelectionListener;
 import com.vaadin.shared.Registration;
@@ -23,11 +40,6 @@ import com.vaadin.shared.data.selection.GridMultiSelectServerRpc;
 import com.vaadin.shared.ui.grid.MultiSelectionModelState;
 import com.vaadin.ui.MultiSelect;
 
-import java.util.*;
-import java.util.function.Consumer;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
-
 /**
  * Multiselection model for grid.
  * <p>
@@ -134,8 +146,7 @@ public class MultiSelectionModelImpl<T> extends AbstractSelectionModel<T>
 
     @Override
     public boolean isSelected(T item) {
-        return isAllSelected()
-                || selectionContainsId(getGrid().getDataProvider().getId(item));
+        return selectionContainsId(getGrid().getDataProvider().getId(item));
     }
 
     /**

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

@@ -0,0 +1,71 @@
+package com.vaadin.tests.components.grid;
+
+import java.util.Iterator;
+import java.util.Set;
+
+import com.vaadin.data.provider.DataProvider;
+import com.vaadin.data.provider.ListDataProvider;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.data.bean.Person;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Grid;
+import com.vaadin.ui.Grid.SelectionMode;
+import com.vaadin.ui.renderers.NumberRenderer;
+
+public class GridSelectAllFiltering extends SimpleGridUI {
+    private String filterText = "Johannes";
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        Grid<Person> grid = new Grid<>();
+        grid.setSelectionMode(SelectionMode.MULTI);
+        grid.setHeightByRows(3);
+        grid.addColumn(Person::getFirstName);
+        grid.addColumn(Person::getAge, new NumberRenderer());
+
+        ListDataProvider<Person> dataProvider = DataProvider
+                .ofCollection(createPersons());
+        dataProvider.setFilter(person -> {
+            if (person.getFirstName().contains(filterText)) {
+                return false;
+            }
+            return true;
+        });
+        grid.setDataProvider(dataProvider);
+
+        Button toggleButton = new Button("Toggle filter", e -> {
+            if ("Johannes".equals(filterText)) {
+                filterText = "Galileo";
+            } else {
+                filterText = "Johannes";
+            }
+            dataProvider.refreshAll();
+        });
+        toggleButton.setId("toggle");
+
+        Button checkButton = new Button("Check selection", e -> {
+            Set<Person> selected = grid.getSelectedItems();
+            Iterator<Person> i = selected.iterator();
+            log("selected " + selected.size()
+                    + (i.hasNext() ? ": " + i.next().getFirstName() : "")
+                    + (i.hasNext() ? ", " + i.next().getFirstName() : "")
+                    + (i.hasNext() ? ", " + i.next().getFirstName() : "")
+                    + (i.hasNext() ? "... " : ""));
+        });
+        checkButton.setId("check");
+
+        addComponents(grid, toggleButton, checkButton);
+    }
+
+    @Override
+    protected Integer getTicketNumber() {
+        return 11479;
+    }
+
+    @Override
+    protected String getTestDescription() {
+        return "Selecting all does not select items that have been "
+                + "filtered out, they should not be shown selected "
+                + "after the filter changes.";
+    }
+}

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

@@ -0,0 +1,62 @@
+package com.vaadin.tests.components.grid;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.openqa.selenium.WebElement;
+
+import com.vaadin.testbench.By;
+import com.vaadin.testbench.elements.ButtonElement;
+import com.vaadin.testbench.elements.GridElement;
+import com.vaadin.tests.tb3.MultiBrowserTest;
+
+public class GridSelectAllFilteringTest extends MultiBrowserTest {
+
+    @Test
+    public void checkSelectAll() {
+        openTestURL();
+
+        GridElement grid = $(GridElement.class).first();
+        ButtonElement toggleButton = $(ButtonElement.class).id("toggle");
+        ButtonElement checkButton = $(ButtonElement.class).id("check");
+
+        // ensure no initial selection
+        checkButton.click();
+        assertEquals("Unexpected log entry,", "1. selected 0", getLogRow(0));
+        assertEquals("Unexpected amount of visually selected rows,", 0,
+                grid.findElements(By.className("v-grid-row-selected")).size());
+
+        // select all
+        WebElement selectAllCheckbox = grid
+                .findElement(By.className("v-grid-select-all-checkbox"));
+        selectAllCheckbox.click();
+
+        // ensure only the two visible rows get selected
+        checkButton.click();
+        assertEquals("Unexpected log entry,",
+                "2. selected 2: Nicolaus Copernicus, Galileo Galilei",
+                getLogRow(0));
+        assertEquals("Unexpected amount of visually selected rows,", 2,
+                grid.findElements(By.className("v-grid-row-selected")).size());
+
+        // toggle filter
+        toggleButton.click();
+
+        // ensure selection did not change but only one selected row is visible
+        checkButton.click();
+        assertEquals("Unexpected log entry,",
+                "3. selected 2: Nicolaus Copernicus, Galileo Galilei",
+                getLogRow(0));
+        assertEquals("Unexpected amount of visually selected rows,", 1,
+                grid.findElements(By.className("v-grid-row-selected")).size());
+
+        // remove all selections
+        selectAllCheckbox.click();
+
+        // ensure all selections got removed whether they were visible or not
+        checkButton.click();
+        assertEquals("Unexpected log entry,", "4. selected 0", getLogRow(0));
+        assertEquals("Unexpected amount of visually selected rows,", 0,
+                grid.findElements(By.className("v-grid-row-selected")).size());
+    }
+}