LetsGoDigital has produced some renders of a potential Huawei smartphone that utilizes a sliding mechanism. The images are based on a patent the Chinese company applied for with the World Intellectual Property Organization. The slider features a front-facing dual camera setup with a flash between the lenses.
https://www.notebookcheck.net/Huawei-s-solution-for-a-full-screen-device-could-be-a-slider-phone.412119.0.html