lineLengthAt method
Length of the line in code units, excluding \n and a preceding \r.
Implementation
int lineLengthAt(int lineIndex) {
final start = getLineStartOffset(lineIndex);
final end = findLineEnd(start);
final lineLength = end - start;
return lineLength > 0 && codeUnitAt(end - 1) == 13
? lineLength - 1
: lineLength;
}