[pygame] get_rel and events

[Fred Burton <flbl@xxxxxxxxxxxxxx>]

I'm using get_rel in a pygame + pyOpenGL app (under Win XP) to get mouse 
movement (for camera/player control), and the event processing stuff for 
clicks in menus.
When it's running slowly, sometimes... er..

When I hold down the mouse button without moving the pointer I get 
repeated MOUSEBUTTONDOWN events. It seems to repeat until the mouse is 
moved or the button is released.

If the mouse if moved rapidly and the button is pressed and held, 
sometimes it does not even get one MOUSEBUTTONDOWN event.

(Sometimes MOUSEBUTTONUP events may be missed too if the mouse is in motion)