Drop the ObscurringWindow functionality on desktop switching
Summary: The ObscurringWindows are a hack to make it more unlikely that the desktop wallpaper becomes visible while switching desktops. This was introduced in 2001 with SVN revision 90111 (git d194f743). In 2001 desktop switching was probably a costly action where it was not possible to just reorder the desktop in one frame. Nowadays we use mostly compositing and with compositing the ObscurringWindows are already disabled. But even in the case that no compositing is used I consider it as very unlikely that the desktop becomes visible during the switching. Given that I think it's time to remove this legacy solution. Test Plan: Compiles Reviewers: #kwin, #plasma Subscribers: plasma-devel, kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D7965
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