Revert multi select using state change

compatibility-client/src/main/java/com/vaadin/v7/client/ui/optiongroup/OptionGroupBaseConnector.java

@@ -43,8 +43,8 @@ public abstract class OptionGroupBaseConnector extends AbstractFieldConnector
         getWidget().selectedKeys = uidl.getStringArrayVariableAsSet("selected");
 
         getWidget().setReadonly(isReadOnly());
-        // Intentional change to use state over UIDL in compatibility package
-        getWidget().multiselect = getState().multiSelect;
+        getWidget().multiselect = "multi"
+                .equals(uidl.getStringAttribute("selectmode"));
         getWidget().immediate = getState().immediate;
         getWidget().nullSelectionAllowed = uidl
                 .getBooleanAttribute("nullselect");

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

@@ -220,6 +220,11 @@ public abstract class AbstractSelect extends AbstractField<Object> implements
 
     }
 
+    /**
+     * Is the select in multiselect mode?
+     */
+    private boolean multiSelect = false;
+
     /**
      * Select options.
      */
@@ -354,6 +359,9 @@ public abstract class AbstractSelect extends AbstractField<Object> implements
     public void paintContent(PaintTarget target) throws PaintException {
 
         // Paints select attributes
+        if (isMultiSelect()) {
+            target.addAttribute("selectmode", "multi");
+        }
         if (isNewItemsAllowed()) {
             target.addAttribute("allownewitem", true);
         }
@@ -1097,7 +1105,7 @@ public abstract class AbstractSelect extends AbstractField<Object> implements
      * @return the Value of property multiSelect.
      */
     public boolean isMultiSelect() {
-        return getState(false).multiSelect;
+        return multiSelect;
     }
 
     /**
@@ -1116,12 +1124,12 @@ public abstract class AbstractSelect extends AbstractField<Object> implements
             throw new IllegalStateException(
                     "Multiselect and NullSelectionItemId can not be set at the same time.");
         }
-        if (multiSelect != getState(false).multiSelect) {
+        if (multiSelect != this.multiSelect) {
 
             // Selection before mode change
             final Object oldValue = getValue();
 
-            getState().multiSelect = multiSelect;
+            this.multiSelect = multiSelect;
 
             // Convert the value type
             if (multiSelect) {
@@ -1789,7 +1797,7 @@ public abstract class AbstractSelect extends AbstractField<Object> implements
      */
     @Override
     public boolean isEmpty() {
-        if (!isMultiSelect()) {
+        if (!multiSelect) {
             return super.isEmpty();
         } else {
             Object value = getValue();

compatibility-shared/src/main/java/com/vaadin/v7/shared/ui/select/AbstractSelectState.java

@@ -27,12 +27,4 @@ public class AbstractSelectState extends AbstractFieldState {
     {
         primaryStyleName = "v-select";
     }
-
-    /**
-     * Is the select in multiselect mode?
-     *
-     * Note that Table and Tree still use the old communication mechanism for
-     * multi-mode support.
-     */
-    public boolean multiSelect;
 }