Bug 305451

Summary: [GTK][WPE][Coordinated Graphics] wheel event async scrolling doesn't work while the main thread is blocked
Product: WebKit Reporter: Fujii Hironori <fujii.hironori>
Component: WebKitGTKAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: bugs-noreply
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
scrollblock.html none

Fujii Hironori
Reported 2026-01-13 21:39:11 PST
[GTK][WPE][Coordinated Graphics] wheel event async scrolling doesn't work while the main thread is blocked 1. Load the content 2. Send wheel events to scroll 3. Sometimes, the page doesn't start scrolling promptly This content repeats blocking the main thread for 2 seconds, and waiting for 1 second. If the wheel event is dispatched while the main thread is blocked, the async scrolling doesn't start until the block ends.
Attachments
scrollblock.html (1.19 KB, text/html)
2026-01-14 00:19 PST, Fujii Hironori 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Fujii Hironori
Comment 1 2026-01-13 22:35:53 PST
Pull request: https://github.com/WebKit/WebKit/pull/56544
Fujii Hironori
Comment 2 2026-01-14 00:19:00 PST
Created attachment 478006 [details] scrollblock.html
EWS
Comment 3 2026-01-28 23:05:59 PST
Committed 306396@main (2f1345fa776a): <https://commits.webkit.org/306396@main> Reviewed commits have been landed. Closing PR #56544 and removing active labels.
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