Method getExpandedRangeInDirection

src/trix/models/composition.js:564–580

(direction, { length } = {})

  }

  getExpandedRangeInDirection(direction, { length } = {}) {
    let [ startPosition, endPosition ] = Array.from(this.getSelectedRange())
    if (direction === "backward") {
      if (length) {
        startPosition -= length
      } else {
        startPosition = this.translateUTF16PositionFromOffset(startPosition, -1)
      }
    } else {
      if (length) {
        endPosition += length
      } else {
        endPosition = this.translateUTF16PositionFromOffset(endPosition, 1)
      }
    }
    return normalizeRange([ startPosition, endPosition ])
  }

  shouldManageMovingCursorInDirection(direction) {
    if (this.editingAttachment) {