Ensure to directly delete old Shadow on update
Summary: So far when deleting a Shadow we used deleteLater which caused it to be deleted in the next event cycle. This could in worst case result in the Shadow being deleted after compositing got suspended. Thus the Shadow not getting removed from the DecorationShadowCache which in turn would mess up rendering on resume of compositing as the cache returns a texture created for a different context. BUG: 361154 FIXED-IN: 5.7.4 Reviewers: #kwin, #plasma Subscribers: kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D2483
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