A question about obscure `4's

[Fatih Demir <kabalak gmx net>]

With some Gtk+ apps I do get a lot of `4's on the screen.
For example in dryad, I do get displays like this :

101   44set_challenge_length(challen);4
      ^^                              ^

Why do I get these 4's into the text-boxes/widgets of Gtk+ ?
Has it got to do something with the fact of ^M-conversion or
 what's up with it.
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