https://bugs.kde.org/show_bug.cgi?id=357896

            Bug ID: 357896
           Summary: Plasmashell and kwin scrambled with qt 5.6 beta when
                    QT_AUTO_SCREEN_SCALE_FACTOR=1
           Product: plasmashell
           Version: master
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: k...@davidedmundson.co.uk
          Reporter: whgen...@gmail.com
                CC: bhus...@gmail.com, plasma-b...@kde.org

Previously in both kwin and plasmashell the "QT_DEVICE_PIXEL_RATIO" var are
unset. Now qt 5.6 deprecated "QT_DEVICE_PIXEL_RATIO" and use
"QT_AUTO_SCREEN_SCALE_FACTOR" instead. 

I solved the problem locally by adding
"qunsetenv("QT_AUTO_SCREEN_SCALE_FACTOR");"  to both kwin and plasmashell.

Reproducible: Always

Steps to Reproduce:
1.  Upgrade qt to 5.6-beta or later.
2.  Set QT_AUTO_SCREEN_SCALE_FACTOR=1 in the env

Actual Results:  
Kwin and plasmashell run into an unusable state.

Other kde-apps works fine (konsole, dolphin).

Expected Results:  
Kwin and plasmashell work normally.

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