Restore the backend set viewport when popping the final render target
Summary: The backend is responsible for setting the viewport, the GLRenderTarget should save and restore the viewport actually set by the backend. Test Plan: Ran Blur effect which uses this method, under scaling the viewport "restored" differed from the one set by the backend. Reviewers: #plasma Subscribers: plasma-devel, kwin, #kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D4952
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71600d0a
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