CPTAnimation does not run while a modal dialog is open

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What steps will reproduce the problem?
1. Implement a coreplot animation (e.g. animate the vertical range in a scatter 
plot when new data arrives).
2. Listen to core data changes (e.g. via 
NSManagedObjectContextDidSaveNotification) and reload data in that plot when 
changes happen.
3. Open a modal dialog that changes something in your core data context.

What is the expected output? What do you see instead?
The vertical range should be adjusted with the animation on reload, just like 
it does with running a modal dialog. Instead the animation is blocked until the 
dialog is closed. It then runs and finishes perfectly.

What version of the product are you using? On what operating system?

Using coreplot 2.0 current head revision on OSX 10.8.

Please provide any additional information below.

Original issue reported on code.google.com by mike.lischke on 25 Aug 2013 at 9:26

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Original comment by eskr...@mac.com on 25 Aug 2013 at 1:08

• Changed state: Accepted

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Original comment by eskr...@mac.com on 25 Aug 2013 at 3:08

• Changed state: Started

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This issue was closed by revision a0e97ac06629.

Original comment by eskr...@mac.com on 1 Sep 2013 at 8:34

• Changed state: Fixed

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Great fix Eric. It solves another problem: slow animations on retina displays 
(if complexity allows only for low fps). Thanks.

Original comment by mike.lischke on 2 Sep 2013 at 7:04