Move ComboBox pageLength to state (#19929)

Use shared state for the page length and update related tests.
This change also removes an unused widget field.

Change-Id: Id8719661121a9570be40028da09e32f27bec82b5

client/src/main/java/com/vaadin/client/ui/VFilterSelect.java

     /** For internal use only. May be removed or replaced in the future. */
     public ComboBoxConnector connector;
 
-    /** For internal use only. May be removed or replaced in the future. */
-    public String paintableId;
-
     /** For internal use only. May be removed or replaced in the future. */
     public int currentPage;
 

client/src/main/java/com/vaadin/client/ui/combobox/ComboBoxConnector.java

             getWidget().inputPrompt = "";
         }
 
+        getWidget().pageLength = getState().pageLength;
+
         Profiler.leave("ComboBoxConnector.onStateChanged update content");
     }
 
      */
     @Override
     public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
-        // Save details
-        getWidget().paintableId = uidl.getId();
-
         if (!isRealUpdate(uidl)) {
             return;
         }

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

         }
     };
 
-    /**
-     * Holds value of property pageLength. 0 disables paging.
-     */
-    protected int pageLength = 10;
-
     // Current page when the user is 'paging' trough options
     private int currentPage = -1;
 
             // clear caption change listeners
             getCaptionChangeListener().clear();
 
-            // The tab ordering number
-            if (getTabIndex() != 0) {
-                target.addAttribute("tabindex", getTabIndex());
-            }
-
             // If the field is modified, but not committed, set modified
             // attribute
             if (isModified()) {
             String[] selectedKeys = new String[(getValue() == null
                     && getNullSelectionItemId() == null ? 0 : 1)];
 
-            target.addAttribute("pagelength", pageLength);
-
             if (suggestionPopupWidth != null) {
                 target.addAttribute("suggestionPopupWidth",
                         suggestionPopupWidth);
     protected List<?> getOptionsWithFilter(boolean needNullSelectOption) {
         Container container = getContainerDataSource();
 
-        if (pageLength == 0 && !isFilteringNeeded()) {
+        if (getPageLength() == 0 && !isFilteringNeeded()) {
             // no paging or filtering: return all items
             filteredSize = container.size();
             assert filteredSize >= 0;
      */
     private List<?> sanitetizeList(List<?> options, boolean needNullSelectOption) {
 
-        if (pageLength != 0 && options.size() > pageLength) {
+        if (getPageLength() != 0 && options.size() > getPageLength()) {
 
             int indexToEnsureInView = -1;
 
             int size) {
         // Not all options are visible, find out which ones are on the
         // current "page".
-        int first = currentPage * pageLength;
+        int first = currentPage * getPageLength();
         if (needNullSelectOption && currentPage > 0) {
             first--;
         }
     private int getLastItemIndexOnCurrentPage(boolean needNullSelectOption,
             int size, int first) {
         // page length usable for non-null items
-        int effectivePageLength = pageLength
+        int effectivePageLength = getPageLength()
                 - (needNullSelectOption && (currentPage == 0) ? 1 : 0);
         return Math.min(size - 1, first + effectivePageLength - 1);
     }
             int indexToEnsureInView, int size) {
         if (indexToEnsureInView != -1) {
             int newPage = (indexToEnsureInView + (needNullSelectOption ? 1 : 0))
-                    / pageLength;
+                    / getPageLength();
             page = newPage;
         }
         // adjust the current page if beyond the end of the list
-        if (page * pageLength > size) {
-            page = (size + (needNullSelectOption ? 1 : 0)) / pageLength;
+        if (page * getPageLength() > size) {
+            page = (size + (needNullSelectOption ? 1 : 0)) / getPageLength();
         }
         return page;
     }
      * @return the pageLength
      */
     public int getPageLength() {
-        return pageLength;
+        return getState(false).pageLength;
     }
 
     /**
      *            the pageLength to set
      */
     public void setPageLength(int pageLength) {
-        this.pageLength = pageLength;
-        markAsDirty();
+        getState().pageLength = pageLength;
     }
 
     /**

shared/src/main/java/com/vaadin/shared/ui/combobox/ComboBoxState.java

      */
     public String inputPrompt = null;
 
+    /**
+     * Number of items to show per page or 0 to disable paging.
+     */
+    public int pageLength = 10;
 }

uitest/src/main/java/com/vaadin/tests/components/combobox/Comboboxes.java

     public class PageLength0ComboBox extends ComboBox {
         public PageLength0ComboBox() {
             super();
-            pageLength = 0;
+            setPageLength(0);
         }
     }
 

uitest/src/main/java/com/vaadin/tests/layouts/MovingComponentsWhileOldParentInvisible.java

 
         ComboBox componentContainerSelect = new ComboBox("Container") {
             {
-                pageLength = 0;
+                setPageLength(0);
             }
         };
         componentContainerSelect.setId("componentContainerSelect");