[webkit-changes] [WebKit/WebKit] 5a1c25: [UI-side compositing] Horizontal scrolling can tri...

[Simon Fraser]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 5a1c25af48a8f877299f911b8c793a5443b6c269
      https://github.com/WebKit/WebKit/commit/5a1c25af48a8f877299f911b8c793a5443b6c269
  Author: Simon Fraser <simon.fraser at apple.com>
  Date:   2023-02-16 (Thu, 16 Feb 2023)

  Changed paths:
    M Source/WebCore/page/scrolling/ScrollingCoordinatorTypes.cpp
    M Source/WebCore/page/scrolling/ScrollingCoordinatorTypes.h
    M Source/WebCore/page/scrolling/ScrollingTree.cpp
    M Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.cpp

  Log Message:
  -----------
  [UI-side compositing] Horizontal scrolling can trigger history swipes instead of scrolling
https://bugs.webkit.org/show_bug.cgi?id=252447
rdar://105574452

Reviewed by Tim Horton.

We can remove the call to willWheelEventStartSwipeGesture() in RemoteScrollingCoordinatorProxy::handleWheelEvent();
it's not used in the WebContent scrolling code path, other than when a wheel event has already been passed to script.
Here, it was incorrectly allowing a swipe from a "began" event.

Some come-along changes: make WheelEventHandlingResult loggable, and fix some logging.

* Source/WebCore/page/scrolling/ScrollingCoordinatorTypes.cpp:
(WebCore::operator<<):
* Source/WebCore/page/scrolling/ScrollingCoordinatorTypes.h:
* Source/WebCore/page/scrolling/ScrollingTree.cpp:
(WebCore::ScrollingTree::computeWheelProcessingSteps):
(WebCore::ScrollingTree::determineWheelEventProcessing):
* Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.cpp:
(WebKit::RemoteScrollingCoordinatorProxy::handleWheelEvent):

Canonical link: https://commits.webkit.org/260430@main