DelayingSizer

[Doug Anderson]

Hello,

I've been trying to figure out how to speed up window (AKA Frame)  
resizing in a Frame that has approximately 4000 elements.  With some  
help from friends, I came up with the idea of delaying the resizing  
until idle time.

I've created a simple helper sizer called "DelayingSizer" that can be  
used generically any time you want to delay resizing until idle  
time.  In testing, this makes window sizing MUCH more responsive  
(it's actually usable now).

I've attached the code for "DelayingSizer", as well as some test code  
that I wrote.  This code should be considered to be under the python  
license.


My hope is:
* If people are interested, someone could add it to the standard  
library of sizers.
* If I've done something super stupid in the code (or if there's a  
simpler, better way to accomplish the same thing), someone will point  
it out.


Hopefully, someone will find this useful.  Enjoy!

-Doug

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