osgGA::GUIEventAdapter::getWindowHeight() returns different values in ::MOVE and in ::FRAME events

[rubenlg]

In the ::MOVE event it returns the correct window height, but in ::FRAME it returns the initial value of _windowHeight (1024).

I need it in ::FRAME in order to debounce mouse events, so I only process one per frame and avoid running expensive computations multiple times per frame.

Here is a minimal repro case:

#include <iostream>
#include <osg/Group>
#include <osgViewer/Viewer>

class MyHandler : public osgGA::GUIEventHandler {
  virtual bool handle(const osgGA::GUIEventAdapter &ea,
                      osgGA::GUIActionAdapter &aa) override {
    switch (ea.getEventType()) {
    case osgGA::GUIEventAdapter::MOVE: {
      std::cout << "IN MOVE " << ea.getWindowHeight() << std::endl;
      break;
    }
    case osgGA::GUIEventAdapter::FRAME: {
      std::cout << "IN FRAME " << ea.getWindowHeight() << std::endl;
      break;
    }
    default:
      return false;
    }
    return true;
  }
};

// Compiled with: g++ main.cc -losg -losgViewer -losgGA

int main() {
  osgViewer::Viewer viewer;
  viewer.addEventHandler(new MyHandler);
  while (!viewer.done()) {
    viewer.frame();
  }
  return 0;
}