Verify that there is no scene windows when Scene is about to be destroyed
Summary: When ~Scene is called, it's not guaranteed that backend is still valid or that there is current opengl context. So, generally speaking, deleting scene windows in ~Scene is a bad idea. It's okay not to delete scene windows in ~Scene because current implementation of Compositor::finish ensures that they don't last longer than the scene. Reviewers: #kwin, davidedmundson Reviewed By: #kwin, davidedmundson Subscribers: kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D19540icc-effect-5.17.5
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