Behavior migration issues

When importing C2 projects, C3 guesses the C3 ID by converting to lowercase and adding dashes, e.g. "My Property" -> "my-property". You used an underscore though ("my_property"), if you use a dash it should import correctly. If it doesn't automatically get the right name you can use the LoadC2Property method. But I just realised none of this is documented, so I should update the docs

Now LoadC2Property is documented here

construct.net/make-games/manuals/addon-sdk/reference/base-classes/iinstancebase

But it's still unclear how to use this method. There's "Script files" property in the c2 version of my plugin. And there's a corresponding "Scriptfiles" property ID in the c3 version. How do I override this using LoadC2Property method?

When C3 imports a C2 project, it guesses the property IDs by transforming the property name. The easiest thing to do is choose IDs in C3 that match the ones it guesses. I think it will guess "script-files". If for any reason you can't do that or you need to change the type of data it imports, here's an example from Tiled Background that converts an "initial visibility" property to a boolean with the new ID "initially-visible":

LoadC2Property(name, valueString)
{
	switch (name) {
	case "initial-visibility":		// renamed, and map Visible/Invisible string to boolean
		this._inst.SetPropertyValue("initially-visible", (valueString !== "Invisible"));
		return true;
	}
}