Hi,
possibly since VBox 6 I'm affected by a bug which blocks mouse click
events on host/guest after a certain sequence of focus in and focus out
events. I created a bug report here:
https://www.virtualbox.org/ticket/20355. Here is a screen cast of the
bug as GIF: https://s3.gifyu.com/images/vbox-bug.gif.
I tried to trace the bug and reached the following focus out event
handler in the file
src/VBox/Frontends/VirtualBox/src/runtime/UIMachineView.cpp:
void UIMachineView::focusOutEvent(QFocusEvent *pEvent)
{
/* If native event filter exists: */
if (m_pNativeEventFilter)
{
/* Uninstall/destroy existing native event filter: */
qApp->removeNativeEventFilter(m_pNativeEventFilter);
delete m_pNativeEventFilter;
m_pNativeEventFilter = 0;
}
/* Call to base-class: */
QAbstractScrollArea::focusOutEvent(pEvent);
}
I figured out, that the bug does not occur if that native event filter
is not uninstalled during a focus out event. Could someone explain why
the filter is actually uninstalled during a focus out event?
I assume there is a possible race condition with the (re-)installation
of the filter in a subsequent focusInEvent.
Kind Regards,
Sascha
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