The latest upstream release is 3.8.2: https://github.com/gtkd-developers/GtkD #1574048 requires an updated version of this package.
tilix-1.7.9-1.fc28 gtkd-3.8.2-1.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-fe48f90862
gtkd-3.8.2-1.fc28, tilix-1.7.9-1.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-fe48f90862
gtkd-3.8.2-1.fc28, tilix-1.7.9-1.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.