Go to Settings -> Theme and choose any other theme. If I restart the program, the default theme is selected. Reproducible: Always
KFourInLine 1.41 - Applications 16.04.3
confirmed with v1.41 / master compiled from sources
Looks like changeTheme slot in kwin4.cpp is never triggered when clicking menu items even though there is a line connect(action, &QAction::triggered, this, &KWin4App::changeTheme);
Git commit 969ced8ee36d711c35680a5383e873a4aa5f78ee by Albert Astals Cid. Committed on 23/05/2017 at 23:09. Pushed by aacid into branch 'Applications/17.04'. Fix theme change not being acted upon Need to connect to the proper triggered signal M +6 -5 src/kwin4.cpp https://commits.kde.org/kfourinline/969ced8ee36d711c35680a5383e873a4aa5f78ee