[Webkit-unassigned] [Bug 235436] [GTK] REGRESSION: Touch scrolling is broken

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235436

--- Comment #2 from Alexander Mikhaylenko <alexm at gnome.org> ---
Ok, and no kinetic scrolling boils down to simply:

```diff
--- a/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBase.cpp
+++ b/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBase.cpp
@@ -2011,7 +2011,7 @@ static void webkitWebViewBaseTouchSwipe(WebKitWebViewBase* webViewBase, gdouble
                 return;
         }

-        webkitWebViewBaseSynthesizeWheelEvent(webViewBase, event, -velocityX / Scrollbar::pixelsPerLineStep(), velocityY / Scrollbar::pixelsPerLineStep(), x, y, WheelEventPhase::NoPhase, WheelEventPhase::Began);
+        webkitWebViewBaseSynthesizeWheelEvent(webViewBase, event, 0, 0, x, y, WheelEventPhase::Ended, WheelEventPhase::NoPhase);
     }
 }


```

Since the kinetic scroll handling currently handles event history and everything, we don't care about the velocity we get from GtkGestureSwipe. On the contrary, it messes things up as the event is no longer a scroll stop event as the deltas are non-0. Makign the event look same as the equivalent touchpad event fixes everything.

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