Tamir Duberstein 37efa18be2
Avoid redundant terminal row clears ( #39075 ) ...
## Why
The custom TUI buffer diff emitted `ClearToEnd` for unchanged trailing blank
regions, producing unnecessary terminal output.
## What changed
- Clear a row tail only when its cached contents changed or a wide glyph overlaps
the clear boundary.
- Keep blank cells marked `AlwaysUpdate` in the drawable region so viewport
invalidation still forces them to repaint.
- Preserve Ratatui's native cell diff behavior for the remaining updates.
## Testing
Add coverage for unchanged row tails, forced blank-cell updates, and shrinking
wide graphemes, including half-width katakana with combining marks.
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Tamir Duberstein
37efa18be2