On June 1, Texas Governor Greg Abbott signed HB 25. It repeals the straight-ticket device. Now, the only states that still have them are Alabama, Indiana, Kentucky, Oklahoma, Pennsylvania, South Carolina, and Utah; and whether Michigan continues to have the device depends on the federal courts. Thanks to Jim Riley for this news.
This does not take effect until 2020, so it still be in effect for the 2018 general election. In Texas, the straight ticket device is only used for general elections. Local elections are non-partisan, and partisan special elections are held without primaries, with a runoff if no candidate receives a majority (same as Louisiana and California under its Top 2 reforms).