Restore type attributes to compatibility UIDL

compatibility-server/src/main/java/com/vaadin/v7/ui/ListSelect.java

@@ -77,7 +77,7 @@ public class ListSelect extends AbstractSelect {
 
     @Override
     public void paintContent(PaintTarget target) throws PaintException {
-        // Width is no longer based on columns
+        target.addAttribute("type", "list");
         // Adds the number of rows
         if (rows != 0) {
             target.addAttribute("rows", rows);

compatibility-server/src/main/java/com/vaadin/v7/ui/NativeSelect.java

@@ -23,6 +23,8 @@ import com.vaadin.event.FieldEvents.BlurListener;
 import com.vaadin.event.FieldEvents.FocusAndBlurServerRpcDecorator;
 import com.vaadin.event.FieldEvents.FocusEvent;
 import com.vaadin.event.FieldEvents.FocusListener;
+import com.vaadin.server.PaintException;
+import com.vaadin.server.PaintTarget;
 import com.vaadin.v7.data.Container;
 import com.vaadin.v7.event.FieldEvents;
 
@@ -60,6 +62,13 @@ public class NativeSelect extends AbstractSelect
         registerRpc(new FocusAndBlurServerRpcDecorator(this, this::fireEvent));
     }
 
+    @Override
+    public void paintContent(PaintTarget target) throws PaintException {
+        target.addAttribute("type", "native");
+
+        super.paintContent(target);
+    }
+
     @Override
     public void setMultiSelect(boolean multiSelect)
             throws UnsupportedOperationException {

compatibility-server/src/main/java/com/vaadin/v7/ui/OptionGroup.java

@@ -71,6 +71,7 @@ public class OptionGroup extends AbstractSelect
 
     @Override
     public void paintContent(PaintTarget target) throws PaintException {
+        target.addAttribute("type", "optiongroup");
         if (isHtmlContentAllowed()) {
             target.addAttribute(OptionGroupConstants.HTML_CONTENT_ALLOWED,
                     true);

compatibility-server/src/main/java/com/vaadin/v7/ui/TwinColSelect.java

@@ -106,6 +106,7 @@ public class TwinColSelect extends AbstractSelect {
 
     @Override
     public void paintContent(PaintTarget target) throws PaintException {
+        target.addAttribute("type", "twincol");
         // Width is no longer based on columns
         // Adds the number of rows
         if (rows != 0) {