LayoutTests:

LayoutTests:

        Reviewed by sullivan

        <rdar://problem/4776765>
        REGRESSION: Caret's ghost left behind after inserting a paragraph separator (11237)

        * fast/repaint/4776765-expected.checksum: Added.
        * fast/repaint/4776765-expected.png: Added.
        * fast/repaint/4776765-expected.txt: Added.
        * fast/repaint/4776765.html: Added.

WebCore:

        Reviewed by sullivan

        <rdar://problem/4776765>
        REGRESSION: Caret's ghost left behind after inserting a paragraph separator (11237)

        We set m_needsLayout to false and call caretRect() in the hopes that it will give us
        the old caret rect.  It in fact corrects the caret rect for an offset that it
        believes is due to scrolling but which is actually due to a change in selection
        without an accompanying layout.  So it returns the new caret rect regardless of
        what m_needsLayout is set to.

        * editing/SelectionController.cpp:
        (WebCore::repaintRectForCaret): Moved the code from caretRepaintRect that
        adds a one pixel slop to this new function.
        (WebCore::SelectionController::caretRepaintRect): Moved this code to
        repaintRectForCaret.
        (WebCore::SelectionController::recomputeCaretRect): Compare the old
        caret rect to the new one that's computed with a fresh layout.  If
        they are different, invalidate both repaint rects.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@17089 268f45cc-cd09-0410-ab3c-d52691b4dbfc