- second round of preparation for Hyatt's "lazy minMaxWidth" change
          http://bugs.webkit.org/show_bug.cgi?id=13431

        These are small changes that are either safe to do first, or unrelated to the main
        change in Hyatt's patch.

        - Preallocate 4 entries each in m_layoutStruct and m_spanCells to save allocation
          in AutoTableLayout.
        - Add an early exit to RenderFlow::dirtyLinesFromChangedChild.
        - Change InlineBox::hasTextChildren() to use a bit directly and never a virtual function.
        - Save a virtual function call by using a local bool variable for isTableCell().

        - Fix containingBlock() so it returns 0 for table cells with no parent.

        - Change all callers who are getting at layer() as a boolean to use hasLayer().
        - Change if statements to max() function calls (only the ones Hyatt had in his patch).
        - Remove some old kdDebug calls.
        - Tweak formatting of some code.
        - Add const in one place.

        * bindings/js/kjs_html.cpp:
        (KJS::HTMLElementFunction::callAsFunction):
        * page/EventHandler.cpp:
        (WebCore::EventHandler::eventMayStartDrag):
        * page/Frame.cpp:
        (WebCore::Frame::clearTimers):
        * rendering/AutoTableLayout.cpp:
        (WebCore::AutoTableLayout::recalcColumn):
        * rendering/AutoTableLayout.h:
        * rendering/InlineBox.h:
        (WebCore::InlineBox::InlineBox):
        (WebCore::InlineBox::hasTextChildren):
        * rendering/InlineFlowBox.cpp:
        (WebCore::InlineFlowBox::nodeAtPoint):
        * rendering/InlineFlowBox.h:
        (WebCore::InlineFlowBox::InlineFlowBox):
        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::layoutBlock):
        (WebCore::RenderBlock::repaintOverhangingFloats):
        (WebCore::RenderBlock::paintChildren):
        (WebCore::RenderBlock::paintFloats):
        (WebCore::RenderBlock::fillBlockSelectionGaps):
        (WebCore::RenderBlock::insertFloatingObject):
        (WebCore::RenderBlock::floatRect):
        (WebCore::RenderBlock::lowestPosition):
        (WebCore::RenderBlock::rightmostPosition):
        (WebCore::RenderBlock::leftmostPosition):
        (WebCore::RenderBlock::addOverhangingFloats):
        (WebCore::RenderBlock::nodeAtPoint):
        (WebCore::RenderBlock::hitTestContents):
        (WebCore::RenderBlock::calcPrefWidths):
        (WebCore::InlineMinMaxIterator::next):
        (WebCore::getBorderPaddingMargin):
        (WebCore::RenderBlock::calcInlinePrefWidths):
        (WebCore::RenderBlock::calcBlockPrefWidths):
        * rendering/RenderContainer.cpp:
        (WebCore::RenderContainer::appendChildNode):
        (WebCore::RenderContainer::insertChildNode):
        * rendering/RenderFlexibleBox.cpp:
        (WebCore::RenderFlexibleBox::calcHorizontalPrefWidths):
        (WebCore::RenderFlexibleBox::calcVerticalPrefWidths):
        * rendering/RenderFlow.cpp:
        (WebCore::RenderFlow::dirtyLinesFromChangedChild):
        * rendering/RenderLayer.cpp:
        (WebCore::RenderLayer::updateVisibilityStatus):
        (WebCore::RenderLayer::updateLayerPosition):
        * rendering/RenderObject.cpp:
        (WebCore::RenderObject::containingBlock):
        * rendering/RenderTable.cpp:
        (WebCore::RenderTable::paint):
        * rendering/RenderTableCell.cpp:
        (WebCore::RenderTableCell::paintBackgroundsBehindCell):
        * rendering/RenderTableRow.cpp:
        (WebCore::RenderTableRow::nodeAtPoint):
        (WebCore::RenderTableRow::paint):
        * rendering/RenderTableSection.cpp:
        (WebCore::RenderTableSection::nodeAtPoint):
        * rendering/RenderTreeAsText.cpp:
        (WebCore::write):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@21082 268f45cc-cd09-0410-ab3c-d52691b4dbfc