QWebEngineView::dropEvent does not forward keyboard modifiers

The QWebEngineView::dropEvent override does not forward keyboard modifiers.
The code @ https://code.woboq.org/qt5/qtwebengine/src/core/web_contents_adapter.cpp.html#1530
does show that 0 is sent unconditionally, while qApp->keyboardModifiers() should be used.
This make it impossible to read the JavaScript drop event modifiers as they are all off.