[BUG] Ext-4.2.0.489 Scroll Button in TabPanel

[PATMAP]

Hi,

1) There is an bug in scroll button in tabpanel with RTL mode.
The scroll button is disabled and cant scroll to next tabs.
This error have in Fire Fox and IE but work in Google Chrome.

2) If i set

activeTab: 7

then i cant see this tab and not scroll on this tab.

I test on FireFox 19.0, IE 10, Google Chrome 25.0.1364.97

Sample Code:

Ext.require([
    'Ext.tab.*'
]);


Ext.onReady(function(){


    var tabs2 = Ext.widget('tabpanel', {
        renderTo: document.body,
        activeTab: 0,
        width: 600,
        height: 250,
        plain: true,
        rtl:true,
        defaults :{
            autoScroll: true,
            bodyPadding: 10
        },
        items: [
            {
                title: 'Normal Tab 1',
                html: "My content was added during construction."
            },{
                title: 'Normal Tab 2',
                html: "My content was added during construction."
            },{
                title: 'Normal Tab 3',
                html: "My content was added during construction."
            },{
                title: 'Normal Tab 4',
                html: "My content was added during construction."
            },{
                title: 'Normal Tab 5',
                html: "My content was added during construction."
            },{
                title: 'Normal Tab 6',
                html: "My content was added during construction."
            },{
                title: 'Normal Tab 7',
                html: "My content was added during construction."
            },{
                title: 'Normal Tab 8',
                html: "My content was added during construction."
            },{
                title: 'Normal Tab 9',
                html: "My content was added during construction."
            }
        ]
    });
});

RTLTabBug1.png

[mitchellsimoens]

Thanks for the report