Review Request 123949: Add forward declaration of QIODevice

[Heiko Becker]

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https://git.reviewboard.kde.org/r/123949/
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Review request for KDE Edu.


Repository: step


Description
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This fixes the build with Qt 5.5. Otherwise it fails with "..step/worldmodel.h:187:18: error: 'QIODevice' has not been declared"


Diffs
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  step/worldmodel.h 17c72d5 

Diff: https://git.reviewboard.kde.org/r/123949/diff/


Testing
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Successfully built with Qt 5.5.0-beta


Thanks,

Heiko Becker

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