Bug 188894 - [Cocoa] First scroll gesture in pinned, non-rubber-banding WKWebView may fail to initiate back/forward swipe
Summary: [Cocoa] First scroll gesture in pinned, non-rubber-banding WKWebView may fail...
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebKit2 (show other bugs)
Version: Other
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: mitz
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2018-08-23 11:33 PDT by mitz
Modified: 2018-08-23 12:51 PDT (History)
2 users (show)

See Also:

Attachments
Set the rubber-band state from the event dispatcher thread (2.16 KB, patch)
2018-08-23 11:42 PDT, mitz 		thorton: review+
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Description mitz 2018-08-23 11:33:28 PDT 
Sometimes the first swipe gesture in a WKWebView would fail to initiate a back/forward swipe despite the view being pinned to the edge and non-rubber-banding. This happens because of a race condition in EventDispatcher::wheelEvent, where setting the rubber-band state is dispatched to the scrolling thread, whereas querying the rubber-banding state happens immediately right after that on the event dispatcher thread, under tryToHandleWheelEvent().
Comment 1 mitz 2018-08-23 11:38:42 PDT 
<rdar://problem/43651434>
Comment 2 mitz 2018-08-23 11:42:37 PDT 
Created attachment 347941 [details]
Set the rubber-band state from the event dispatcher thread
Comment 3 mitz 2018-08-23 12:51:40 PDT 
Fixed in <https://trac.webkit.org/r235236>.