[Webkit-unassigned] [Bug 155750] [GTK] Add kinetic scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155750

--- Comment #20 from Andre Moreira Magalhaes <andrunko at gmail.com> ---
Created attachment 281711
  --> https://bugs.webkit.org/attachment.cgi?id=281711&action=review
Patch - new features + bugfix

I've used this patch in an internal project and made some modifications that you may find useful. I am posting the updated patch without ChangeLogs, feel free to update it or let me know if you prefer if I do it.

The changes included in this patch (on top of latest one from Adrien):
- overshoot animations support (ScrollAnimationKinetic.cpp)
- bugfix for a crash when starting a drag while scrolling (GestureController.cpp)
- build fix for gtk < 3.20 (PlatformWheelEventGtk.cpp)
- bugfix for gtk < 3.20 to properly copy NativeWebWheelEvent (is_stop is not available in gtk < 3.20 and the phase/momentumPhase were not being properly copied on the NativeWebWheelEvent copy constructor, making the page "jump" during scroll instead of starting momentum scroll - NativeWebWheelEventGtk.cpp)
- respect scrollbar policy (ScrollAnimationKinetic.cpp + ScrollAnimatorGtk.cpp)

That should be it, please let me know what you think.

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