ScrollView::convertChildToSelf() and convertSelfToChild() offset the point by the scroll position, but this fails to take top content inset, and left-side scrollbars into account. This code path isn't hit in general browsing, but future PDF plugin code needs it to work.
<rdar://problem/116430905>
Pull request: https://github.com/WebKit/WebKit/pull/18594
Committed 268942@main (7b193c245074): <https://commits.webkit.org/268942@main> Reviewed commits have been landed. Closing PR #18594 and removing active labels.