Why Text component shows differently when renderType(QtRendering/NativeRendering) differs in Win7-opengl environment by using freetype engine?

[dhuta]

As the title tells, on my win7 platform with Qt5.4.2 opengl mingw distribution, the Text qml component cannot show exactly the same when renderType differs. The font engine is freetype by passing the parameters -platform windows:fontengine=freetype to QApplicition. It is easy to reproduce this problem by watching the contentWidth property of Text.

But as far as i know, the previous version i used - Qt5.3.1 shows exactly the same.

Anyone has the same problem?