GWindow:: Multiple Calls to addTimerListener / removeTimerListener cause a buildup of duplicate timers.

[koopdi]

The following code causes this::animate() to be called 21 times every second.
// testing double timer syndrome

for (int i = 0; i < 10; i++)
{
  win.setTimerListener(1000, [this] { animate(); });
  win.removeTimerListener();
  win.setTimerListener(1000, [this] { animate(); });
  win.removeTimerListener();
}
win.setTimerListener(1000, [this] { animate(); });

[koopdi]

Here is a fix that worked in my particular case. With this change, animate() is called exactly 1 time every second.

// gwindow.cpp
void GWindow::removeTimerListener() {
    removeEventListener("timer");

    GThread::runOnQtGuiThread([this]()
    {
        while(!_iqmainwindow->_timerIDs.empty())
        {
            auto it = _iqmainwindow->_timerIDs.begin();
            _iqmainwindow->timerStop((*it));
        }
    }); // runOnQtGuiThread
}