Felipe Coury 44b9011611
Preserve terminal scrollback when growing the TUI viewport ( #45271 ) ...
## Why
Scrolling with `CSI S` can discard history rows in QTermWidget and xterm.js when the viewport grows.
## What changed
Use newlines at the bottom of the history scroll region for `ScrollbackStrategy::Standard`, preserving the composer and restoring the cursor and full-screen scroll region afterward. Fall back to full-screen scrolling when only one history row exists, since `DECSTBM` requires two distinct rows. Skip scrolling when there are no history rows or no rows to scroll.
## Testing
Add regression tests for composer and cursor preservation, scroll-region restoration, emitted newline sequences, single-row scrollback preservation, and no-op growth. Snapshot visible geometry for growth by one, three, and four rows.
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Felipe Coury
44b9011611