[DUPE-144] Scrolling a sortable tabbar breaks sort

[meyerovb]

Scroll the tabbar and then try to sort, notice the icon is offset by the scroll amount and can't be moved all the way to the right. Related tickets: 144 & 150

Ext.setup({ onReady: function () {
var t = [];
for (var x = 0; x < 25; x++)
    t[t.length] = { title: 'Tab' + x };
new Ext.TabPanel({
    fullscreen: true,
    sortable: true,
    tabBar: { scroll: 'horizontal' },
    items: t
});
}});

[Jamie Avins]

All related, I'll add this to the same ticket.