qSqrt of negative argument.

Qt 4.6 RC, LGPL version.

In qpaintengine_raster.cpp, line 3243 the qSqrt is called. Argument can be negative:

if (ti.fontEngine->fontDef.pixelSize * qSqrt(s->matrix.determinant()) >= 64)

For transformations involving reflection, the matrix determinant can become negative. Here we need only the absolute value of the determinant. So, please, put s->matrix.determinant() into qAbs:

if (ti.fontEngine->fontDef.pixelSize * qSqrt(qAbs(s->matrix.determinant())) >= 64)