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Vlad Zahorodnii authored
Summary: After a widget has been unregistered, a WinIdChange event may be sent. If that happens, ShadowHelper is going to try to install a shadow for the corresponding widget. Obviously, this is wrong. Test Plan: Added a qDebug in ~ShadowHelper to ensure that _shadows is empty. Reviewers: #plasma, broulik Reviewed By: #plasma, broulik Subscribers: plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D28073
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