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@@ -448,6 +448,21 @@ describe('parseAnsiLines: bounded state and true widths', () => {
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expect(onlySpan(`\u4e2dx${ESC}[1K|`)).toEqual({ text: ' |', style: undefined })
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})
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+ it('clears the lead when the write lands on the spacer itself', () => {
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+ // Two backspaces from after `中x` stop ON the wide glyph's second cell;
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+ // writing there blanks the lead through the spacer side of the pair clear,
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+ // so the glyph cannot survive as half a character.
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+ expect(onlySpan(`中x${BS}${BS}A`)).toEqual({ text: ' Ax', style: undefined })
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+ })
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+
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+ it('keeps a surviving spacer as a blank when its lead was replaced by a spacer', () => {
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+ // `好` written over the first glyph's spacer puts its own spacer on the
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+ // second glyph's lead cell — a write that goes down without a pair clear.
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+ // The second glyph's spacer survives with a dead lead and must emit a
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+ // blank, or everything after it shifts one column left.
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+ expect(onlySpan(`中中${BS}${BS}${BS}好`)).toEqual({ text: ' 好 ', style: undefined })
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+ })
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+
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it('blanks both halves of a wide pair when either is overwritten', () => {
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// A terminal cannot leave one cell of a two-cell glyph standing, so writing
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// over the spacer clears the lead as well.
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imccyu