textinput: render the full placeholder when Width is 0#976
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The buffer for the placeholder runes was sized as Width()+1, so a Width of 0 left exactly one slot. copy(p, []rune(m.Placeholder)) silently dropped everything past the first character and View() then rendered a one-letter placeholder. Size the buffer to the longer of Width+1 and the placeholder itself so all runes survive when the input has no explicit width. The "width set" branch still trims to fit; the unset branch now renders the placeholder in full. Closes charmbracelet#950. Signed-off-by: Charlie Tonneslan <cst0520@gmail.com>
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Closes #950.
The placeholder buffer was sized to `Width()+1` runes, so a `Width` of 0 left exactly one slot. `copy(p, []rune(m.Placeholder))` silently dropped everything past the first character and `View()` then rendered a one-letter placeholder.
Size the buffer to the longer of `Width()+1` and the placeholder itself so all runes survive when the input has no explicit width. The width-set branch still trims to fit.
Added `TestPlaceholderZeroWidth` covering the regression.