305561 2026-01-15 05:45:46 -0800 [GTK][WPE][Coordinated Graphics] Paint scrollbars in the scrolling thread for async scrolling 2026-02-05 00:18:33 -0800 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 306856 1 fujii webkit-unassigned bugs-noreply oldest_to_newest 2172172 0 fujii 2026-01-15 05:45:46 -0800 [GTK][WPE][Coordinated Graphics] Paint scrollbars in non-main thread for async scrolling 1. Load attachment#477989 2. Scroll the page by wheel events 3. scrollbars aren't updated while the main thread is blocked ScrollerMac.mm is Mac's implementation to paint scrollbars. It's using the internal NSScrollerImp SPI. https://github.com/WebKit/WebKit/blob/main/Source/WebCore/page/scrolling/mac/ScrollerMac.mm https://github.com/WebKit/WebKit/blob/main/Source/WebCore/PAL/pal/spi/mac/NSScrollerImpSPI.h 2175586 1 fujii 2026-01-27 16:13:37 -0800 Pull request: https://github.com/WebKit/WebKit/pull/57368 2178285 2 ews-feeder 2026-02-05 00:18:29 -0800 Committed 306838@main (8e1ad9587c9f): <https://commits.webkit.org/306838@main> Reviewed commits have been landed. Closing PR #57368 and removing active labels.