     var delta = 0
     if rowStart > 0 {
       delta = self.cells[rowStart - 1][self.size.width - 1].flatCharIndex
-        - self.oneDimCellIndex(forRow: rowStart - 1,
-                                  column: self.size.width - 1)
+              - self.oneDimCellIndex(forRow: rowStart - 1,
+                                     column: self.size.width - 1)
     }
 
     for row in rowStart...rowEndInclusive {

    let attrId = self.cells[position.row][position.column].attrId

    guard attrId < CellAttributesCollection.defaultAttributesId
            || attrId == CellAttributesCollection.reversedDefaultAttributesId
      else {
      return
    }


  func isSane(_ position: Position) -> Bool {
    if position.column < 0
       || position.column >= self.size.width
       || position.row < 0
       || position.row >= self.size.height {
      return false
    }

