2012-04-16 Antonio Gomes <agomes@rim.com>

2012-04-16  Antonio Gomes  <agomes@rim.com>

        Screen shift down when VKB shows by clicking in a input box MKS_3601371
        PR #149846

        Reviewed by Rob Buis.

        After switching from ScrollView::canOverscroll to ScrollView::constrainsScrollingToContentEdge
        we had a less restricted code path allowing/disallowing overscrolling. That caused
        some webpages like google.com to get on overscroll when adjusting the scroll
        position to ensure the focused input field is visible.

        Patch restricts the way we allow overscrolling to the bottom, where the virtual
        keyboard pops up from, clamping it to 0, 0 if it tries to
        overscroll upwards, and to maximum scroll position if it overscrolls
        downwards.

        Internally reviewed by Mike Fenton.
        PR #149846

        * WebKitSupport/InputHandler.cpp:
        (BlackBerry::WebKit::InputHandler::ensureFocusTextElementVisible):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114288 268f45cc-cd09-0410-ab3c-d52691b4dbfc