Only send active window changes to X11 root window if the X11 window changed
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. Reviewers: #kwin, #plasma Subscribers: plasma-devel, kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D7096
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778b7d03
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