QTest::mouseEvent and QtQuickTest::mouseEvent do not set timestamp

QGuiApplicationPrivate::processMouseEvent() (http://code.qt.io/cgit/qt/qtbase.git/tree/src/gui/kernel/qguiapplication.cpp#n1890) sets timestamp:

QMouseEvent ev(type, localPoint, localPoint, globalPoint, button, buttons, e->modifiers, e->source);
ev.setTimestamp(e->timestamp);

QTest::mouseEvent does not: http://code.qt.io/cgit/qt/qtbase.git/tree/src/testlib/qtestmouse.h#n196

Neither QtQuickTest::mouseEvent do:
http://code.qt.io/cgit/qt/qtdeclarative.git/tree/src/qmltest/quicktestevent.cpp#n167

Due to this the timestamp() method of a QMouseEvent generated by a QTest::mouseClick() always returns 0.

In Qt WebEngine we use timestamp() function to recognize non-single clicks (double, triple, whatever clicks):
http://code.qt.io/cgit/qt/qtwebengine.git/tree/src/core/render_widget_host_view_qt.cpp?h=5.8#n921

Currently two subsequent mouseClick() call is detected as a double click no matter how long waiting between two clicks. Due to this we can't test/simulate clicking without workarounds (eg. https://codereview.qt-project.org/#/c/172158/).