X11: QWidget::activateWindow() does not work reliably

I'd like to force my app (Qt Creator) into the foreground, e.g. when the app currently debugged hits a breakpoint. However,

raise();
activateWindow():

doesn't work reliably for me. Sometimes it activates Qt Creator, sometimes it just 'flashes' the icon of Qt Creator, sometimes it does nothing.

That's because the X11 _NET_ACTIVE_WINDOW event is initialized with

e.xclient.data.l[1] = X11->userTime;

depending on the last interaction with Qt Creator this might have been loong ago. Changing it to

e.xclient.data.l[1] = X11->time;

Makes raise() behave as expected!

If activateWindow() is called in ubuntu (unity) it does not brings the focus to the window as it can be demonstrated in showHide example atttached.
-Run the example and press C (to create a new window)
-Press T to toggle Hide and show,if focus is not in new window it will hide