message: [contour] Trying to fix Blur header error on Qt6.
diff: #include <QtCore/QElapsedTimer>
  #include <QtCore/QtMath>
  #include <QtGui/QOffscreenSurface>
  +#include <QtGui/QOpenGLContext>
  #include <QtGui/QVector2D>
  #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
  #include <QtOpenGL/QOpenGLBuffer>
  - #include <QtOpenGL/QOpenGLContext>
  #include <QtOpenGL/QOpenGLFramebufferObject>
  #include <QtOpenGL/QOpenGLFunctions_3_3_Core>
  #include <QtOpenGL/QOpenGLShaderProgram>
  #include <QtOpenGL/QOpenGLVertexArrayObject>
  #else
  #include <QtGui/QOpenGLBuffer>
  - #include <QtGui/QOpenGLContext>
  #include <QtGui/QOpenGLFramebufferObject>
  #include <QtGui/QOpenGLFunctions_3_3_Core>
  #include <QtGui/QOpenGLShaderProgram>
  