#1917 Tab scrolling places wrong position

[Jumper Chen]

For example,

<zk xmlns:n="http://www.zkoss.org/2005/zk/native">
You should see the "Tab Last" is selected and scroll to the right-most closed to the "->" icon.
<n:table width="100%" style="table-layout:fixed">
<n:tr>
<n:td>
<div width="100%"><div><tabbox width="100%">
<tabs>
<tab label="Tab 12222222222222222222" closable="true"/>
<tab label="Tab 22222222222222222222222222" closable="true"/>
<tab label="Tab 32222222222222222" closable="true"/>
<tab label="Tab 4222222222222222222222" closable="true"/>

<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>

<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>

<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/> <tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab 522222222222222222222222" closable="true"/>
<tab label="Tab Last" closable="true" selected="true"/> </tabs>
<tabpanels>
<tabpanel>This is panel 1</tabpanel>
<tabpanel>This is panel 2
The second panel</tabpanel>
<tabpanel>This is panel 3</tabpanel>
<tabpanel>This is panel 4</tabpanel>
<tabpanel>This is panel 5</tabpanel>
</tabpanels>
</tabbox>
</div></div>
</n:td>
</n:tr>
</n:table>
</zk>

[Jumper Chen]

Fixed since 2010/04/01