Issue #1723: gih file that crashes gimp-2.10.
The flag `free_selection_string` is used to track an array of strings with some of them being static and others allocated. This should have been an array of boolean but we can't change it because it is public API (though it should really not have been!). So let's just allocate every string of the `selection` array instead, which makes the boolean flag useless now.
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