After shifting sorting and searching logic from the `Query` collection in [21898], it became apparent that `Query` collections should also have an accurate `props` model, as the model controls the aforementioned searching and sorting.
see #21921, #21809, and #21390.
git-svn-id: https://develop.svn.wordpress.org/trunk@21900 602fd350-edb4-49c9-b593-d223f7449a82
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