diff -Naur qt-everywhere-opensource-src-4.7.0-orig/src/3rdparty/webkit/WebCore/platform/graphics/qt/GraphicsContextQt.cpp qt-everywhere-opensource-src-4.7.0/src/3rdparty/webkit/WebCore/platform/graphics/qt/GraphicsContextQt.cpp

--- qt-everywhere-opensource-src-4.7.0-orig/src/3rdparty/webkit/WebCore/platform/graphics/qt/GraphicsContextQt.cpp	2010-09-10 13:05:21 +0400

+++ qt-everywhere-opensource-src-4.7.0/src/3rdparty/webkit/WebCore/platform/graphics/qt/GraphicsContextQt.cpp	2010-10-10 12:13:18 +0400

@@ -51,6 +51,8 @@

 #include "Pattern.h"

 #include "Pen.h"

+#include <QtCore>

+

 #include <QBrush>

 #include <QDebug>

 #include <QGradient>

@@ -780,8 +782,31 @@

     if (paintingDisabled())

         return;

+#if !defined(Q_WS_X11)

     IntPoint endPoint = origin + IntSize(width, 0);

     drawLine(origin, endPoint);

+#else

+    IntPoint p1 = origin;

+    IntPoint p2 = origin + IntSize(width, 0);

+

+    // if paintengine type is X11 to avoid artifacts

+    // like bug https://bugs.webkit.org/show_bug.cgi?id=42248

+    QPainter* p = m_data->p();

+    if (p->paintEngine()->type() == QPaintEngine::X11) {

+        // If stroke thiknes is odd we need decrease Y coordinate by 1,

+        // because inside methotod adjustLineToPixelBoundaries(...), which

+        // called from drawLine(...), Y coordinate will be increased by 0.5f

+        // and then inside Qt painting engine will be rounded to next greater

+        // integer value

+        float strokeWidth = strokeThickness();

+        if (static_cast<int>(strokeWidth) % 2) { //odd

+            p1.setY(p1.y() - 1);

+            p2.setY(p2.y() - 1);

+        }

+    }

+

+    drawLine(p1, p2);

+#endif // !defined(Q_WS_X11)

 }

 void GraphicsContext::drawLineForMisspellingOrBadGrammar(const IntPoint&, int, bool)