[Merge] lp:~ahayzen/webbrowser-app/dnd-handle-design-001 into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Needs Fixing

In setPreviewBorderWidth(), previewBorderWidthChanged should be emitted, not previewTopCropChanged.

In drag-helper.cpp, the include of <QtCore/QSizeF> is not needed, as it’s already included in drag-helper.h. Same for <QtGui/QColor>.
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https://code.launchpad.net/~ahayzen/webbrowser-app/dnd-handle-design-001/+merge/309342
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