Fix for WebKit bug 29968 - Selecting text with text-overflow ellipsis

    Fix for WebKit bug 29968 - Selecting text with text-overflow ellipsis
        should not show cut off text
        https://bugs.webkit.org/show_bug.cgi?id=29968

        Reviewed by Dan Bernstein.

        Also fixes the issue on both Mac OS X and Windows where the highlight
        would extend only partway into the ellipsis based on the size of the
        characters being truncated.

        Test: editing/selection/select-text-overflow-ellipsis.html

        WebCore:

        * rendering/EllipsisBox.cpp:
        (WebCore::EllipsisBox::paint):
        When the ellipsis have been selected, paints them with the color for
        selected text.
        (WebCore::EllipsisBox::selectionRect):
        Returns the selection rect for the ellipsis text.
        (WebCore::EllipsisBox::paintSelection):
        Paints the selection highlight around the ellipsis text.

        * rendering/EllipsisBox.h:
        (WebCore::EllipsisBox::EllipsisBox):
        Default the selection state of the EllipsisBox to SelectionNone.
        (WebCore::EllipsisBox::setSelectionState):
        Allow the selection state to be explicitly set by the InlineTextBox
        that it is associated with, since the selection state depends on the
        position of the selection within the truncated text.
        (WebCore::EllipsisBox::selectionState):
        Return the cached selection state.

        * rendering/InlineTextBox.cpp:
        (WebCore::InlineTextBox::selectionState):
        If the text is truncated and the selection extends into the truncation
        where there are ellipsis, set the selection state on the EllipsisBox.
        (WebCore::paintTextWithShadows):
        Allow for an upper bound to be specified on the maximum length of the
        text to be painted.
        (WebCore::InlineTextBox::paint):
        Make sure the text that is drawn gets appropriately truncated. This was
        not an issue before on Mac OS X because it wasn't necessary to draw the
        selected text separately (the selected text had the same color as the
        non-selected text).
        (WebCore::InlineTextBox::paintSelection):
        If the text is being truncated, let whatever is being painted in the
        space after the truncated text paint its own highlight.

        * rendering/InlineTextBox.h:
        (WebCore::InlineTextBox::truncation):
        Allow RenderText to access the truncation status.

        * rendering/RenderText.cpp:
        (WebCore::RenderText::selectionRectForRepaint):
        Make sure that any ellipsis box that falls within the selection also
        gets repainted.

        Places the expected results under the mac and win platforms separately
        because they are pixel test results and also the size of the
        RenderBlocks are showing up as slightly different between mac and win.

        LayoutTests:

        * editing/selection/select-text-overflow-ellipsis.html: Added.
        * platform/mac/editing/selection/select-text-overflow-ellipsis-expected.checksum: Added.
        * platform/mac/editing/selection/select-text-overflow-ellipsis-expected.png: Added.
        * platform/mac/editing/selection/select-text-overflow-ellipsis-expected.txt: Added.
        * platform/win/editing/selection/select-text-overflow-ellipsis-expected.checksum: Added.
        * platform/win/editing/selection/select-text-overflow-ellipsis-expected.png: Added.
        * platform/win/editing/selection/select-text-overflow-ellipsis-expected.txt: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@52548 268f45cc-cd09-0410-ab3c-d52691b4dbfc