so 
 .unselectable, .line-breaker {
      -moz-user-select: -moz-none;
      -khtml-user-select: none;
      -webkit-user-select: none;
      -ms-user-select: none;
      user-select: none; }

[download]

In reply to Re^3: Change default style sheet: add line numbers ( user-select: none; ) by Anonymous Monk
in thread Change default style sheet: add line numbers by roboticus

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