fix(textinput): show full placeholder when width is unset#982
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Allocate enough runes for the full placeholder before copying so width 0 no longer truncates to the first character. Fixes charmbracelet#779 Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
SetWidthis not called (width 0),placeholderViewnow allocates enough space for the full placeholder instead of a single runeFixes #779
Also addresses #950 (0 width breaks placeholders).
Test plan
go test ./textinput/...TestPlaceholderZeroWidthMade with Cursor