Comment 6 for bug 622350

Inkscape shouldn't crash any longer in this case (as of rev. #9728).

What happened was that while changing or resetting the node tool (or any other tool too), the desktop->event_context was NULL for a short period of time. This makes it impossible to process any events during that short period, but there has never been a check implemented to prevent this from happening. I've merely added a safety check which discards those inconvenient events.

The new node tool however did happen to generate a such inconvenient events, because when setting up the node tool it is assumed that the selection has changed, which again invokes a screen update, leading to GDK_LEAVE_NOTIFY events. I'll ask Krzysztof if he can look into this. Maybe it can be avoided to update the screen when setting up the node tool.