D8485: Fix viewport for screenshot on multiple screens

[Kamil Piwowarski]

kpiwowarski created this revision.
kpiwowarski added reviewers: KWin, Plasma.
kpiwowarski added a project: KWin.
Restricted Application edited projects, added Plasma; removed KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  https://phabricator.kde.org/D8479 fixes viewport for real hardware, but there is still problem with screenshots. This patch fixes that.

TEST PLAN
  - Have three monitors (like in bug 385655)
  - Press PrtSc and then Enter
  - Screenshot is ok
  
  Before: 
  F5450056: Screenshot_20171025_232900.png <https://phabricator.kde.org/F5450056>
  After:
  F5450058: Screenshot_20171026_010701.png <https://phabricator.kde.org/F5450058>

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D8485

AFFECTED FILES
  libkwineffects/kwinglutils.cpp

To: kpiwowarski, #kwin, #plasma
Cc: plasma-devel, kwin, #kwin, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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