D4952: Restore the backend set viewport when popping the final render target

[David Edmundson]

davidedmundson created this revision.
Restricted Application added a project: KWin.
Restricted Application added subscribers: KWin, kwin, plasma-devel.

REVISION 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.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D4952

AFFECTED FILES
  libkwineffects/kwinglutils.cpp
  libkwineffects/kwinglutils.h

To: davidedmundson, #plasma
Cc: plasma-devel, kwin, #kwin, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol
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