Since at least the 5.11 beta, and probably since: https://cgit.kde.org/plasma-desktop.git/commit/?h=Plasma/5.11&id=4ba9b01e2d6acc361f4ac0c7e4c21066eb575146 it is no longer possible to right click the 'favourite system actions' in kicker and remove them. Normal favourites are still removable. The error output to console is: /usr/share/plasma/plasmoids/org.kde.plasma.kicker/contents/code/tools.js:47: TypeError: Cannot read property 'runningActivities' of undefined Hence the advertised feature in the draft plasma 5.11 announcement "The Kicker application launcher now hides its sidebar if no favorites are present, leading to a cleaner look." simply cannot be activated, as it is not possible to removal both types of favourites from the sidebar via the GUI.
Created attachment 108220 [details] PoC that fixes the API mismatch The reason for this bug is that tools.js does not support SimpleFavoritesModel anymore. I attached a patch that changes KAStatsFavoritesModel to be a superset of SimpleFavoritesModel and adjusts tools.js to use the SimpleFavoritesModel API if necessary.
Update proposed revision from Fabian Vogt here I believe https://phabricator.kde.org/D8178
Git commit 06f01ed291ca21057497fd0ceaa69f6e4d324bc3 by Fabian Vogt. Committed on 10/10/2017 at 16:53. Pushed by fvogt into branch 'Plasma/5.11'. Fix editing items in SimpleFavoritesModel Summary: tools.js is supposed to support both KaStatsFavoritesModel (used for favorite applications) and SimpleFavoritesModel (used for system actions, like poweroff/reboot/logout). The latter did not work though, as tools.js unconditionally calls methods only present in KaStatsFavoritesModel. This commit makes KaStatsFavoritesModel API compatible to SimpleFavoritesModel and changes the relevant code in tools.js to support both. Additionally, this syncs applets/kickoff/package/contents/code/tools.js again. Test Plan: Before this patch it wasn't possible to remove system actions from the favorites bar. Reviewers: #plasma, davidedmundson Reviewed By: #plasma, davidedmundson Subscribers: hein, davidedmundson, rikmills, plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D8178 M +6 -6 applets/kicker/package/contents/code/tools.js M +2 -2 applets/kicker/plugin/kastatsfavoritesmodel.cpp M +13 -11 applets/kickoff/package/contents/code/tools.js https://commits.kde.org/plasma-desktop/06f01ed291ca21057497fd0ceaa69f6e4d324bc3