D6639: [Color Picker] Fix picking colors in multi-screen

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Simplifies code and also grab just one pixel instead of the entire screen.
  
  BUG: 382261
  FIXED-IN: 5.10.4

TEST PLAN
  Picks correct color on both screens and also seems to pick fine with device pixel ratio (plasmashell doesn't use it but plasmoidviewer does)
  
  Code from QColorDialog

REPOSITORY
  R114 Plasma Addons

REVISION DETAIL
  https://phabricator.kde.org/D6639

AFFECTED FILES
  applets/colorpicker/plugin/grabwidget.cpp

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