Fixed 3138743, 3138678, and 3138854.  Removed the RenderText
        widths cache, replaced it with a much simply monospace character
        cache.  Should be much faster for covered cases too!  Also fixed
        buffer overrun problem causing the crash in 3138854.

        Reviewed by darin.

        * khtml/rendering/font.cpp:
        (Font::isFixedPitch):
        * khtml/rendering/font.h:
        * khtml/rendering/render_text.cpp:
        (TextSlave::checkSelectionPoint):
        (RenderText::RenderText):
        (RenderText::setStyle):
        (RenderText::~RenderText):
        (RenderText::shouldUseMonospaceCache):
        (RenderText::cacheWidths):
        (RenderText::widthFromCache):
        (RenderText::trimmedMinMaxWidth):
        (RenderText::calcMinMaxWidth):
        (RenderText::setText):
        (RenderText::width):
        * khtml/rendering/render_text.h:
        * kwq/KWQFont.h:
        * kwq/KWQFont.mm:
        (QFont::isFixedPitch):
        * kwq/WebCoreTextRendererFactory.h:
        * kwq/WebCoreTextRendererFactory.m:
        (-[WebCoreTextRendererFactory isFontFixedPitch:]):

WebKit:
        Support for fixes to 3138743, 3138678.  Added
        isFontFixedPitch used to determine if font is fixed
        pitch.  Makes use of appkit private _isFakeFixedPitch
        (detects courier and monoca).  Updated our fakey test
        to use the appkit's version.

        Reviewed by darin.

        * WebCoreSupport.subproj/WebTextRenderer.m:
        * WebCoreSupport.subproj/WebTextRendererFactory.m:
        (-[WebTextRendererFactory isFontFixedPitch:]):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3250 268f45cc-cd09-0410-ab3c-d52691b4dbfc