Ext Version
Whatever used in the API Documentation. I use 4.1.1

Browser
Chrome 22

Description
selectOnFocus not honored when navigating using keyboard tab. Works with mouse select. selectOnFocus honored for textfield for both keyboard and mouse.

Steps to reproduces problem
Create form. Add few textfieldareas with selectOnFocus : true and navigate using keyboard tabs

Expected Result
Previously entered text should be selected

Result that occured:
Focus goes to beginning of textared

Test Case
Code pasted from example in the textarea documentation and added additional fields to demonstrate tab navigation.

Code:
Ext.create('Ext.form.Panel', {
    title       : 'Sample TextArea',
    width       : 400,
    bodyPadding : 10,
    renderTo    : Ext.getBody(),
    items       : [
        {
            xtype         : 'textareafield',
            grow          : true,
            name          : 'message',
            fieldLabel    : 'Message',
            anchor        : '100%',
            value         : 'text area 1',
            selectOnFocus : true
        },
        {
            xtype         : 'textareafield',
            grow          : true,
            name          : 'message1',
            fieldLabel    : 'Message1',
            anchor        : '100%',
            value         : 'text area 2',
            selectOnFocus : true
        },
        {
            xtype         : 'textfield',
            grow          : true,
            name          : 'message2',
            fieldLabel    : 'Message3',
            anchor        : '100%',
            value         : 'text field',
            selectOnFocus : true
        }
    ]
});