PdfUtil.getStringWidth() can return incorrect results for multi-line strings

[asdf00000]

The method PdfUtil.getStringWidth() should calculate the length of every line, not just the line that contains the longest string.
The width of the individual letters can be very different so a string with less characters can be wider than a string with more characters. For instance, a single w is wider then three times i.

Example:

String line1 = "iii";

String line2 = "www";
float w1 = PdfUtil.getStringWidth( line1 + "\n" + line2, PDType1Font.HELVETICA, 10);
float w2 = PdfUtil.getStringWidth( line2 + "\n" + line1, PDType1Font.HELVETICA, 10);

result:
w1 = 6.66
w2 = 21.66

both should return 21.66