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How can I stop a function so it can restart again?

 
Greenhorn
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Hi,

I have this function:



that is fired by this button:


but if you click the button again, the original function continues working while the second one executes.

If you want to see it in action, it's here

Is there some way that that button click can say "stop the first one and start the next one"?

thanks for your help.
 
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