Touch screen operation is abnormal in WINCE7.0 platform

We run the sample program "diagramscene" in WINCE7.0 platform. the menu can be open up and the menu item can be click run when use mouse.
But the menu item cannot be click run when use touch screen. This problem is not exist in QT5.4.2. it begins from QT5.5.0, and QT5.6.0,
QT5.5.1 has also the problem. The touch screen operation menu function is normal after we modified the source code as below
D:\QT\5.5.1\qtbase\src\gui\kernel\qguiapplication.cpp line:2465
original content:
if(e->synthetic() && !touchEvent.isAccepted() && qApp->testAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents)) {
modified content:
if (0){//!e->synthetic() && !touchEvent.isAccepted() && qApp->testAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents)) {