User-agent: Mozilla Thunderbird 1.0.7 (Windows/20050923)
We have the need to track when the mouse enters and exits a Composite.
But we haven't been able to figure out how to do this reliably. The
Composite is made up of other widgets: labels, buttons, etc. If we try
to track the enter and exit of those composites we can't translate these
events to the parent because the x and y aren't the exact point that
entry occured, they're close but rarely exact. This makes it impossible
to reliably know if the mouse entered on a border that is the border of
a composite. Is there another way to do this?