Okay the item I'm trying to mirror is a masked group, is it possible to have the center anchor be the center of the mask?
That method works, I'm a step closer, so thanks ya, but it seems to anchor the center of the content, and the object flies off in different directions.
I don't know the kind and the position of your mask (in layers hierarchy). Let us say it is also sel
app.selection.resize(-100, 100, true, true, true, true, 100, Transformation.CENTER);
(Note: You cannot mirror an opacity mask)
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