Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 23e019f46ecb45cfb2262881ec29172be7d861cf
https://github.com/WebKit/WebKit/commit/23e019f46ecb45cfb2262881ec29172be7d861cf
Author: Simon Fraser <[email protected]>
Date: 2026-04-30 (Thu, 30 Apr 2026)
Changed paths:
M Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h
M Source/WebKit/UIProcess/API/ios/WKWebViewIOS.mm
Log Message:
-----------
[iOS] Improve scroll position preservation on rotation in RTL pages
https://bugs.webkit.org/show_bug.cgi?id=313714
rdar://175910769
Reviewed by Mike Wyrzykowski.
Add `_scrollOffsetAdjustedForObscuredInset:`, which is the inverse of
`_contentOffsetAdjustedForObscuredInset:`, and use it in `_beginLiveResize`.
`_didCommitLayerTreeDuringAnimatedResize:` had the classic scroll position/
scroll offset confusion, which breaks side-scrolling RTL pages with non-zero
scrollOrigin. Fix by converting the scrollPosition to a scroll offset before
computing contentOffsets.
No test, because rotation is not reliably testable. Manual testing shows
that this improves the behavior.
* Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h:
* Source/WebKit/UIProcess/API/ios/WKWebViewIOS.mm:
(-[WKWebView _scrollOffsetAdjustedForObscuredInset:]):
(-[WKWebView _didCommitLayerTreeDuringAnimatedResize:mainFrameData:]):
(-[WKWebView _updateLiveResizeTransform]):
(-[WKWebView _beginLiveResize]):
Canonical link: https://commits.webkit.org/312391@main
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