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NSCell:trackMouse always calls setNextState, why?

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NSCell:trackMouse always calls setNextState, why?

Subject: NSCell:trackMouse always calls setNextState, why?
From: "T vH" <email@hidden>
Date: Mon, 7 Aug 2006 13:49:14 +0200

I'm having a little problem with the default implementation of NSCells'
trackMouse:inRect:ofView:untilMouseUp:

Besides the documented
-startTrackingAt:inView:
-continueTracking:at:inView:
-stopTracking:at:inView:mouseIsUp:

methods it also seems to invoke setNextState.

While this seems useful it is also called if the mouse was dragged
outside the control before mouse up and usually no state change should
happen than.

While there are various possibilities to block setNextState I'm
wondering how this is meant to be used to your advantage.
Thx, Tim
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