Thx for asking the question about closures (didn't know the wording neither) Wandamey, and the explanation merlight!
Reading chips comment:
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In a lot of cases this can be avoided during play time by setting the handler on the control in the XML or on a template (virtual = true) in the XML so that cost is paid during the load. The handler closure should also only be made once instead of every time SetHandler is called, by storing the closure in a local or on a table
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I'd like to repeat Wandamey's question:
Is there a difference between setting the handler via XML, or creating the controls in the lua script and assigning the handlers there?
In what cases should we use XML definitions then.
And how are we supposed to define it in an XML file?
Maybe we can get an example of an anonymous closure that is creating spikes, and the same thing fixed in lua script, and in addition fixed in XML instead? This would be great.