Method offsetAtDisplayWidth

src/utils/Cursor.ts:1270–1291

* Find the string offset that corresponds to a target display width.

(targetWidth: number)

   * Find the string offset that corresponds to a target display width.
   */
  private offsetAtDisplayWidth(targetWidth: number): number {
    if (targetWidth <= 0) return 0

    let currentWidth = 0
    const boundaries = this.getGraphemeBoundaries()

    // Iterate through grapheme boundaries
    for (let i = 0; i < boundaries.length - 1; i++) {
      const start = boundaries[i]
      const end = boundaries[i + 1]
      if (start === undefined || end === undefined) continue
      const segment = this.text.substring(start, end)
      const segmentWidth = stringWidth(segment)

      if (currentWidth + segmentWidth > targetWidth) {
        return start
      }
      currentWidth += segmentWidth
    }

    return this.text.length
  }

  private measureWrappedText(): WrappedLine[] {
    const wrappedText = wrapAnsi(this.text, this.columns, {