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Vlad Zahorodnii authored
Summary: In KWin, we need to know when a sub-surface becomes mapped or unmapped so we can generate or filter out window quads for the sub-surface. Reviewers: #kwin, davidedmundson, apol Reviewed By: #kwin, davidedmundson, apol Differential Revision: https://phabricator.kde.org/D29256
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