Charlie Marsh b6e153c985
Render only visible rows in the transcript pager ( #39063 ) ...
## Why
Scrolling the transcript pager previously rendered a scratch buffer containing
all rows through the visible viewport, including hidden content above it. This
made rendering work and buffer size grow with the scroll offset.
## What changed
- Add viewport-aware rendering for committed transcript cells and the live tail.
- Forward scrolled rendering through cached and inset renderables while keeping
the full-height fallback for renderables that do not support it.
- Keep hyperlink metadata aligned with scrolled text.
## Testing
Add coverage comparing viewport-aware output with the full-height fallback
across wrapping widths, offsets, insets, styles, hyperlinks, and live tails.
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Charlie Marsh
b6e153c985