<table><tr><td style="">graesslin created this revision.<br />graesslin added reviewers: KWin, Plasma.<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/D2980" rel="noreferrer">View Revision</a></tr></table><br /><div><strong>REVISION SUMMARY</strong><div><p>The modifier-only-shortcuts break as soon as KWin grabs the keyboard<br />
(e.g. alt+tab, present windows, etc.). The investigation shows that in<br />
that case KWin does not get any raw key events any more and thus gets<br />
confused about the state of the hold modifiers. E.g. alt+tab has the<br />
alt key pressed, but we miss the release as the keyboard is grabbed.</p>
<p>This change addresses the problem by installing an additional event<br />
filter for key press and release event which only filters for key events<br />
on the root window. That way we can be sure that it only operates when<br />
KWin grabbed the keyboard on the root window.</p>
<p>Note: the problem only exists when grabbing on the root window. If the<br />
grab is on another window (e.g. moving a window) we still do get all<br />
events.</p>
<p>The problem also seems to not happen if another application grabbed<br />
keys on the root window. E.g. for key combinations grabbed by<br />
kglobalaccel the correct sequence of key press/release as raw events<br />
are reported. Also while the screen is locked the evemts are reported<br />
and kscreenlocker grabs the keyboard on the root window.</p></div></div><br /><div><strong>TEST PLAN</strong><div><p>Used Alt+Tab and Present Windows and tried to activate launcher<br />
afterwards.</p></div></div><br /><div><strong>REPOSITORY</strong><div><div>rKWIN KWin</div></div></div><br /><div><strong>BRANCH</strong><div><div>mod-only-root-grabbed-keyboard</div></div></div><br /><div><strong>REVISION DETAIL</strong><div><a href="https://phabricator.kde.org/D2980" rel="noreferrer">https://phabricator.kde.org/D2980</a></div></div><br /><div><strong>AFFECTED FILES</strong><div><div>plugins/platforms/x11/standalone/xinputintegration.cpp<br />
plugins/platforms/x11/standalone/xinputintegration.h</div></div></div><br /><div><strong>EMAIL PREFERENCES</strong><div><a href="https://phabricator.kde.org/settings/panel/emailpreferences/" rel="noreferrer">https://phabricator.kde.org/settings/panel/emailpreferences/</a></div></div><br /><div><strong>To: </strong>graesslin, KWin, Plasma<br /><strong>Cc: </strong>plasma-devel, kwin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas<br /></div>