<table><tr><td style="">graesslin created this revision.<br />Restricted Application added a project: KWin.<br />Restricted Application added subscribers: kwin, plasma-devel.
</td><a style="text-decoration: none; padding: 4px 8px; margin: 0 8px 8px; float: right; color: #464C5C; font-weight: bold; border-radius: 3px; background-color: #F7F7F9; background-image: linear-gradient(to bottom,#fff,#f1f0f1); display: inline-block; border: 1px solid rgba(71,87,120,.2);" href="https://phabricator.kde.org/D7096" rel="noreferrer">View Revision</a></tr></table><br /><div><strong>REVISION SUMMARY</strong><div><p>So far KWin always updated the active window property even if the actual<br />
window id hasn't changed. E.g. if a Wayland window was active and another<br />
Wayland window gets activated the window id was and stays 0.</p>
<p>Nevertheless KWin updated the property causing wakeups in X server and<br />
any application listening to property changes on the root window.</p>
<p>Futhermore this situation is an information leak: we leak when a Wayland<br />
window gets activated to X11.</p>
<p>To solve this problem RootInfo caches the active window id and only<br />
updates if it changes.</p></div></div><br /><div><strong>TEST PLAN</strong><div><p>Verified with xev -root that the active window does not get<br />
updated needlessly.</p></div></div><br /><div><strong>REPOSITORY</strong><div><div>R108 KWin</div></div></div><br /><div><strong>BRANCH</strong><div><div>root-info-only-on-change</div></div></div><br /><div><strong>REVISION DETAIL</strong><div><a href="https://phabricator.kde.org/D7096" rel="noreferrer">https://phabricator.kde.org/D7096</a></div></div><br /><div><strong>AFFECTED FILES</strong><div><div>activation.cpp<br />
netinfo.cpp<br />
netinfo.h</div></div></div><br /><div><strong>To: </strong>graesslin, KWin, Plasma<br /><strong>Cc: </strong>plasma-devel, kwin, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas<br /></div>