[Webkit-unassigned] [Bug 176896] Wrong caret position for input field inside a fixed position parent on iOS 11

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176896

--- Comment #10 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
The problem is triggered by code in FrameView::updateLayoutViewport(). If we have an m_layoutViewportOverrideRect, and m_inProgrammaticScroll is true, then we compute a new layoutViewportOverride rect. We recompute a caret rect with this new layout viewport. However, the next visible content rect update from the UI process resets the layout viewport to its old value, but doesn't trigger a caret rect update because we think nothing changed.

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