/// <summary>
/// Returns the last non-whitespace position on the given line, or null if
/// the line is empty or contains only whitespace.
/// </summary>
public static int?GetLastNonWhitespacePosition(this ITextSnapshotLine line)
{
var startPosition = line.Start;
var text = line.ToString();
for (var i = text.Length - 1; i >= 0; i--)
{
if (!char.IsWhiteSpace(text[i]))
{
return(startPosition + i);
}
}
return(null);
}