Sort models after fetching when orders conditions are applied to search

[lubatti]

I've found that after applying a custom order logic to the search engine and retrieving a subset of ids, these ids can be re-sorted during the fetching of the models.

[crynobone]

This is only supported by MySQL and SQLite and will cause syntax error in Postgres and MSSQL

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!