Take footer into account in column dnd-reorder (#16643)

Change-Id: I0358d1b18f65d40325b6c1bc3f3e4d3b9249fb5f

client/src/com/vaadin/client/widgets/Grid.java

 import com.vaadin.client.widget.grid.sort.SortOrder;
 import com.vaadin.client.widgets.Escalator.AbstractRowContainer;
 import com.vaadin.client.widgets.Grid.Editor.State;
+import com.vaadin.client.widgets.Grid.StaticSection.StaticCell;
+import com.vaadin.client.widgets.Grid.StaticSection.StaticRow;
 import com.vaadin.shared.data.sort.SortDirection;
 import com.vaadin.shared.ui.grid.GridConstants;
 import com.vaadin.shared.ui.grid.GridStaticCellType;
             int leftBound = -1;
             int rightBound = getColumnCount() + 1;
 
-            for (int r = 0; r < getHeaderRowCount(); r++) {
-                HeaderRow headerRow = getHeaderRow(r);
-                if (!headerRow.hasSpannedCells()) {
+            final List<StaticRow<?>> rows = new ArrayList<StaticRow<?>>();
+            rows.addAll(header.getRows());
+            rows.addAll(footer.getRows());
+            for (StaticRow<?> row : rows) {
+                if (!row.hasSpannedCells()) {
                     continue;
                 }
                 for (int c = frozenColumns; c < getColumnCount(); c++) {
-                    HeaderCell cell = headerRow.getCell(getColumn(c));
-                    assert cell != null : "Somehow got a null cell for row:cell "
-                            + r + ":" + c;
+                    StaticCell cell = row.getCell(getColumn(c));
                     int colspan = cell.getColspan();
                     if (colspan <= 1) {
                         continue;

uitest/src/com/vaadin/tests/components/grid/basicfeatures/GridColumnReorderTest.java

     }
 
     @Test
-    public void testColumnReorder_cellInsideASpannedHeader_cantBeDroppedOutsideSpannedArea() {
+    public void testColumnReorder_cellInsideSpannedHeader_cantBeDroppedOutsideSpannedArea() {
         // given
         toggleColumnReorder();
         selectMenuPath("Component", "Header", "Append row");
         assertColumnHeaderOrder(1, 3, 4, 5, 2);
     }
 
+    @Test
+    public void testColumnReorder_footerHasSpannedCells_cantDropInside() {
+        // given
+        toggleColumnReorder();
+        selectMenuPath("Component", "Footer", "Append row");
+        selectMenuPath("Component", "Footer", "Row 1", "Join columns 1, 2");
+        assertColumnHeaderOrder(0, 1, 2, 3, 4);
+
+        // when
+        dragAndDropColumnHeader(0, 3, 1, 80);
+
+        // then
+        assertColumnHeaderOrder(0, 3, 1, 2, 4);
+    }
+
+    @Test
+    public void testColumnReorder_cellInsideASpannedFooter_cantBeDroppedOutsideSpannedArea() {
+        // given
+        toggleColumnReorder();
+        selectMenuPath("Component", "Footer", "Append row");
+        selectMenuPath("Component", "Footer", "Row 1", "Join columns 1, 2");
+        assertColumnHeaderOrder(0, 1, 2, 3, 4);
+
+        // when
+        dragAndDropColumnHeader(0, 2, 0, 20);
+
+        // then
+        assertColumnHeaderOrder(0, 2, 1, 3, 4);
+    }
+
+    @Test
+    public void testColumnReorder_cellInsideTwoCrossingSpanningFooters_cantTouchThis() {
+        // given
+        toggleColumnReorder();
+        selectMenuPath("Component", "Footer", "Append row");
+        selectMenuPath("Component", "Footer", "Append row");
+        selectMenuPath("Component", "Footer", "Row 1", "Join column cells 0, 1");
+        selectMenuPath("Component", "Footer", "Row 2", "Join columns 1, 2");
+        dragAndDropColumnHeader(0, 3, 0, 10);
+        assertColumnHeaderOrder(3, 0, 1, 2, 4);
+
+        // when
+        dragAndDropColumnHeader(0, 2, 0, 10);
+
+        // then
+        assertColumnHeaderOrder(3, 0, 1, 2, 4);
+    }
+
+    @Test
+    public void testColumnReorder_cellsInsideTwoAdjacentSpannedHeaderAndFooter_reorderingLimited() {
+        // given
+        toggleColumnReorder();
+        selectMenuPath("Component", "Header", "Append row");
+        selectMenuPath("Component", "Footer", "Append row");
+        selectMenuPath("Component", "Header", "Row 2", "Join columns 3, 4, 5");
+        dragAndDropColumnHeader(0, 0, 4, 80);
+        scrollGridHorizontallyTo(0);
+        dragAndDropColumnHeader(0, 1, 4, 80);
+        scrollGridHorizontallyTo(0);
+        selectMenuPath("Component", "Footer", "Row 1", "Join columns 1, 2");
+        assertColumnHeaderOrder(1, 3, 4, 5, 2);
+
+        // when then
+        dragAndDropColumnHeader(0, 1, 3, 80);
+        assertColumnHeaderOrder(1, 4, 3, 5, 2);
+
+        dragAndDropColumnHeader(0, 2, 4, 10);
+        assertColumnHeaderOrder(1, 4, 3, 5, 2);
+
+        dragAndDropColumnHeader(0, 2, 0, 10);
+        assertColumnHeaderOrder(1, 3, 4, 5, 2);
+    }
+
     private void toggleColumnReorder() {
         selectMenuPath("Component", "State", "Column Reordering");
     }