Fix bug column and row expand ratio are not persisted

Fixes #9009

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

@@ -1277,14 +1277,14 @@ public class GridLayout extends AbstractLayout
         }
         setRows(Math.max(rows.size(), 1));
         Map<Component, Alignment> alignments = new HashMap<>();
-        List<Integer> columnExpandRatios = new ArrayList<>();
+        List<Float> columnExpandRatios = new ArrayList<>();
         for (int row = 0; row < rowElements.size(); ++row) {
             Element rowElement = rowElements.get(row);
 
             // Row Expand
             if (rowElement.hasAttr("expand")) {
-                int expand = DesignAttributeHandler.readAttribute("expand",
-                        rowElement.attributes(), int.class);
+                float expand = DesignAttributeHandler.readAttribute("expand",
+                        rowElement.attributes(), float.class);
                 setRowExpandRatio(row, expand);
             }
 
@@ -1334,11 +1334,11 @@ public class GridLayout extends AbstractLayout
                 if (row == 0) {
                     if (col.hasAttr("expand")) {
                         for (String expand : col.attr("expand").split(",")) {
-                            columnExpandRatios.add(Integer.parseInt(expand));
+                            columnExpandRatios.add(Float.parseFloat(expand));
                         }
                     } else {
                         for (int c = 0; c < colspan; ++c) {
-                            columnExpandRatios.add(0);
+                            columnExpandRatios.add(0f);
                         }
                     }
                 }
@@ -1442,7 +1442,7 @@ public class GridLayout extends AbstractLayout
 
             // Row Expand
             DesignAttributeHandler.writeAttribute("expand", row.attributes(),
-                    (int) getRowExpandRatio(i), 0, int.class, designContext);
+                     getRowExpandRatio(i), 0.0f, float.class, designContext);
 
             int colspan = 1;
             Element col;
@@ -1483,7 +1483,7 @@ public class GridLayout extends AbstractLayout
                         // A column with expand and no content in the end of
                         // first row needs to be present.
                         for (int c = j; c < componentMap[i].length; ++c) {
-                            if ((int) getColumnExpandRatio(c) > 0) {
+                            if (getColumnExpandRatio(c) > 0) {
                                 hasExpands = true;
                             }
                         }
@@ -1525,7 +1525,7 @@ public class GridLayout extends AbstractLayout
                     String expands = "";
                     boolean expandRatios = false;
                     for (int c = 0; c < colspan; ++c) {
-                        int colExpand = (int) getColumnExpandRatio(j + c);
+                        float colExpand = getColumnExpandRatio(j + c);
                         if (colExpand > 0) {
                             expandRatios = true;
                         }

server/src/test/java/com/vaadin/tests/server/component/gridlayout/GridLayoutDeclarativeTest.java

@@ -52,8 +52,8 @@ public class GridLayoutDeclarativeTest
         b3.setCaptionAsHtml(true);
         b4.setCaptionAsHtml(true);
         String design = "<vaadin-grid-layout><row>" //
-                + "<column expand=1>" + writeChild(b1) + "</column>" //
-                + "<column expand=3>" + writeChild(b2) + "</column>" //
+                + "<column expand=1.0>" + writeChild(b1) + "</column>" //
+                + "<column expand=3.3>" + writeChild(b2) + "</column>" //
                 + "</row><row>" //
                 + "<column>" + writeChild(b3) + "</column>" //
                 + "<column>" + writeChild(b4) + "</column>" //
@@ -63,12 +63,29 @@ public class GridLayoutDeclarativeTest
         gl.addComponent(b2);
         gl.addComponent(b3);
         gl.addComponent(b4);
-        gl.setColumnExpandRatio(0, 1.0f);
-        gl.setColumnExpandRatio(1, 3.0f);
+        gl.setColumnExpandRatio(0, 1f);
+        gl.setColumnExpandRatio(1, 3.3f);
         testWrite(design, gl);
         testRead(design, gl);
     }
 
+    @Test
+    public void testReadIntegerExpandRatioGridLayout() {
+        //To make sure that it can read from old declarative which use
+        // integer expand ratio
+        Button b1 = new Button("Button 0,0");
+        b1.setCaptionAsHtml(true);
+        String design = "<vaadin-grid-layout><row expand=3>" //
+                + "<column expand=1>" + writeChild(b1) + "</column>" //
+                + "</row>"//
+                + "</vaadin-grid-layout>";
+        GridLayout gl = new GridLayout(1, 1);
+        gl.addComponent(b1);
+        gl.setColumnExpandRatio(0, 1.0f);
+        gl.setRowExpandRatio(0, 3.0f);
+        testRead(design, gl);
+    }
+
     @Test
     public void testOneBigComponentGridLayout() {
         Button b1 = new Button("Button 0,0 -&gt; 1,1");
@@ -153,7 +170,7 @@ public class GridLayoutDeclarativeTest
         gl.setColumnExpandRatio(2, 2.0f);
 
         String design = "<vaadin-grid-layout><row>" //
-                + "<column colspan=4 rowspan=5 expand='0,0,2,0' />" //
+                + "<column colspan=4 rowspan=5 expand='0.0,0.0,2.0,0.0' />" //
                 + "<column rowspan=5>" + writeChild(b1) + "</column>" //
                 + "</row><row>" //
                 + "</row><row>" //
@@ -174,7 +191,7 @@ public class GridLayoutDeclarativeTest
 
         String design = "<vaadin-grid-layout><row>" //
                 + "<column rowspan=5>" + writeChild(b1) + "</column>" //
-                + "<column colspan=4 rowspan=5 expand='0,0,0,2' />" //
+                + "<column colspan=4 rowspan=5 expand='0.0,0.0,0.0,2.0' />" //
                 + "</row><row>" //
                 + "</row><row>" //
                 + "</row><row>" //