One line per line break
  line 0: rawTextLength=3 textBlockBeginIndex=0 first=true
  line 1: rawTextLength=2 textBlockBeginIndex=3 first=false

Carriage Return
  line 0: rawTextLength=3 textBlockBeginIndex=0 first=true
  line 1: rawTextLength=2 textBlockBeginIndex=3 first=false

Carriage Return + Line Feed
  line 0: rawTextLength=4 textBlockBeginIndex=0 first=true
  line 1: rawTextLength=2 textBlockBeginIndex=4 first=false

Double Line Feed
  line 0: rawTextLength=3 textBlockBeginIndex=0 first=true
  line 1: rawTextLength=1 textBlockBeginIndex=3 first=false
  line 2: rawTextLength=2 textBlockBeginIndex=4 first=false

Line separator
  line 0: rawTextLength=3 textBlockBeginIndex=0 first=true
  line 1: rawTextLength=2 textBlockBeginIndex=3 first=false

Paragraph separator
  line 0: rawTextLength=3 textBlockBeginIndex=0 first=true
  line 1: rawTextLength=2 textBlockBeginIndex=3 first=false

No line break
  line 0: rawTextLength=4 textBlockBeginIndex=0 first=true

Trailing line break
  line 0: rawTextLength=3 textBlockBeginIndex=0 first=true
