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Backport .titles attribute for selection containers to 7.x
One of the differences between 7.x and 8.x is the .titles attribute for selection containers. I've seen a number of people confused trying to use .titles in 7.x. Recently, we made the change backwards compatible in 8.x. I think it would be great to backport this change to 7.x now that it is backwards compatible, and it would help ease people into the 8.x syntax.