ngraham added a comment.
Never mind, I was an idiot and hadn't restarted kded5. Almost everything works perfectly after that. I only found two bugs: - When you delete the current theme, the combobox becomes empty. It should probably go back to the default theme or Breeze or something. - If you click on the Install from File... button and cancel the dialog, you get an ugly error message: F7867995: Screenshot_20200107_101224.png <https://phabricator.kde.org/F7867995> REPOSITORY R99 KDE Gtk Configuration Tool REVISION DETAIL https://phabricator.kde.org/D26261 To: gikari, apol, #vdg, ngraham Cc: baberts, ngraham, plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart