Charlie Marsh ad6e48ddd3
Keep textarea cursors and rendering inside the viewport ( #37166 ) ...
## What changed
- Reserve a continuation row for the insertion point when a logical line exactly fills the textarea width.
- Wrap overflowing spaces and keep cursor movement aligned with the resulting visual rows.
- Clip plain, masked, and styled text rendering to the textarea bounds, and return no cursor position for empty viewports.
## Testing
Add regression coverage for full lines, trailing spaces, scrolling, multi-width graphemes, empty areas, and styled overlays at textarea boundaries.
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Charlie Marsh
ad6e48ddd3