graesslin created this revision. Restricted Application added a project: KWin. Restricted Application added subscribers: kwin, plasma-devel.
REVISION SUMMARY So far KWin always updated the active window property even if the actual window id hasn't changed. E.g. if a Wayland window was active and another Wayland window gets activated the window id was and stays 0. Nevertheless KWin updated the property causing wakeups in X server and any application listening to property changes on the root window. Futhermore this situation is an information leak: we leak when a Wayland window gets activated to X11. To solve this problem RootInfo caches the active window id and only updates if it changes. TEST PLAN Verified with xev -root that the active window does not get updated needlessly. REPOSITORY R108 KWin BRANCH root-info-only-on-change REVISION DETAIL https://phabricator.kde.org/D7096 AFFECTED FILES activation.cpp netinfo.cpp netinfo.h To: graesslin, #kwin, #plasma Cc: plasma-devel, kwin, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas
