[Webkit-unassigned] [Bug 238093] preventScroll does not work with dynamically created elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238093

--- Comment #4 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Layout calls FrameSelection::setNeedsSelectionUpdate() which resets m_selectionRevealMode to SelectionRevealMode::Reveal here:

    if (innerTextSizeChanged && frame().selection().isFocusedAndActive() && document().focusedElement() == &inputElement()) {
        // The caps lock indicator was hidden or shown. If it is now visible then it may be occluding
        // the current selection (say, the caret was after the last character in the text field).
        // Schedule an update and reveal of the current selection.
        frame().selection().setNeedsSelectionUpdate(FrameSelection::RevealSelectionAfterUpdate::Forced);
    }

This is trying to ensure that text within the input is scrolled into view, but has the side effect of also triggering page scrolling.

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