WebCore:

      2008-06-30  Adele Peterson  <adele@apple.com>

        Reviewed by Anders.

        Fix for <rdar://problem/5301322> REGRESSION: Select All selects the whole page when used in readonly textareas

        Test: editing/selection/select-all-textarea.html

        * dom/Node.cpp:
        (WebCore::Node::shadowAncestorNode): Break out code to find the root of the shadow tree into a new helper function.
        (WebCore::Node::shadowTreeRootNode): Added helper function.
        * dom/Node.h:
        * dom/Range.cpp: (WebCore::Range::shadowTreeRootNode): Added helper function.
        * dom/Range.h:
        * editing/Selection.cpp: (WebCore::Selection::shadowTreeRootNode): ditto.
        * editing/Selection.h:
        * editing/SelectionController.h: (WebCore::SelectionController::shadowTreeRootNode): ditto.
        * editing/SelectionController.cpp: (WebCore::SelectionController::selectAll):
        If the selection is in a shadow tree, only select the contents of that shadow tree,