Reviewed by Dave Hyatt.

    Reviewed by Dave Hyatt.

        - fixed <rdar://problem/3949203> cannot tab to, within, or out of the RSS sidebar

        * kwq/KWQSlider.mm:
        (-[KWQSlider becomeFirstResponder]):
        (-[KWQSlider resignFirstResponder]):
        (-[KWQSlider nextKeyView]):
        (-[KWQSlider previousKeyView]):
        (-[KWQSlider canBecomeKeyView]):
        (-[KWQSlider nextValidKeyView]):
        (-[KWQSlider previousValidKeyView]):
        Copied these methods from KWQButton. The lack of special handling for first-responder-ness
        here was causing the focus to get "stuck" on the RSS page's slider widget. Added FIXME
        about how it would be nice to share more of this code rather than replicating it in each
        KWQ widget subclass.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8484 268f45cc-cd09-0410-ab3c-d52691b4dbfc