macOS.

Some Cocoa app wants to know whether the cursor moved from any point to a point 
outside of some rect.

Currently I use polling (which looks kind of inefficient).

I tried NSTrackingArea, but this does not work:

1. if the cursor is initially NOT in the rect, the app does not get notified:
Workaround: user moves cursor into the rect (not very good).

2. if the app is hidden under some other windows, it also does not get notified.
Workaround: user removes covering windows of other apps, then moves cursor into 
the rect (even worse).

Gerriet.

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