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-setNeedsDisplay: different between Tiger and Leopard

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-setNeedsDisplay: different between Tiger and Leopard

Subject: -setNeedsDisplay: different between Tiger and Leopard
From: John Stiles <email@hidden>
Date: Fri, 14 Dec 2007 10:13:15 -0800

I am writing code that moves a control from one place to another. In Leopard, this works great:

[control setNeedsDisplay:YES]; // clean up at old location
[control setFrame:newFrame]; // move control
[control setNeedsDisplay:YES]; // redraw at new location

However, in Tiger, this doesn't work properly; the control is not erased from its old location. It behaves as if the first -setNeedsDisplay: was not called at all. (And in fact, on Leopard, if you remove the first -setNeedsDisplay:, you get the same artifacts.)

What's the simplest way to fix this on all OSes?

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