- Fixed scrolled-up readers being yanked to the tail on POSIX terminals when streaming content arrived; unknown native viewport position was treated as "at bottom", triggering destructive history rebuilds.
- Fixed appended rows slipping down by the height delta when a resize and new content coalesced into one frame; height-grow repaint now only fires when content fits within the new viewport.
- Added regression test covering the height-grow-with-new-content case.
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