[Webkit-unassigned] [Bug 163911] window.find does not scroll with overflow:auto content on mobile Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163911

--- Comment #14 from Frédéric Wang (:fredw) <fred.wang at free.fr> ---
Created attachment 316866

  --> https://bugs.webkit.org/attachment.cgi?id=316866&action=review

Patch

So for the record, I'm uploading the experimental patch I had to try and do the same operations as "Focus" i.e.

1) IPC call to perform WKContentView _zoomTo*Rect (smart magnification + scrolling)
2) Followed by a call to WebCore::RenderLayer::scrollRectToVisible for the overflow nodes

The following video demonstrates some bugs with attachment 312006: https://people.igalia.com/fwang/ios/2017-07-28/find.mov ; I had variants of the patch with the same issues...

1) Rendering may become wrong when the main frame is scrolled/zoomed.
2) Highlight is missing when the inner overflow node is scrolled.
3) When some text of the inner overflow node is highlighted, scrolling that node does not update the rendering of the highlighted text

I am not sure how to handle all the cases but maybe we could agree on a first step to address the most important issue (no scrolling of inner frames) and use cases (only a single overflow:auto body)? For example, I'm moving (3) to bug 175032.

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