Review Request 119001: Add support for high-precision touchpad scrolling

[Commit Hook]

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This review has been submitted with commit d717090c9f4dcff60bee665f1434ec07862fee65 by Kai Uwe Broulik to branch frameworks.

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On June 28, 2014, 6:47 p.m., Kai Uwe Broulik wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/119001/
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> (Updated June 28, 2014, 6:47 p.m.)
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> Review request for Dolphin.
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> Repository: kde-baseapps
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> Description
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> This adds support for QWheelEvent's pixelDelta() which reports pixel-precise scrolling, mainly on touchpads. Since Qt 5.3 this is supported on X11 using XInput2, breaking Dolphin's custom scrolling on those devices.
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> Diffs
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>   dolphin/src/kitemviews/kitemlistcontainer.cpp 39e6296 
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> Diff: https://git.reviewboard.kde.org/r/119001/diff/
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> Testing
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> Tested both vertical and horizontal scrolling using both mouse and touchpad.
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> For some reason, although it returns a QPoint with x() and y() values, only y() is ever populated on my machine, even when doing horizontal touchpad gestures. Someone with a horizontally scrollable mousewheel might want to give this a try. I encountered this problem also in QtQuick, so might be a X11 QPA limitation.
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> Thanks,
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> Kai Uwe Broulik
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