Issue 2330: BUG: After undo-ing all changes to code shown in OBrowser, it should not be marked as dirty

>
> http://code.google.com/p/pharo/issues/detail?id=2330
>
> Pharo image: Pharo-1.0 #10517
> Virtual machine used: Squeak 4.2.4beta1U (Mac)
> Class browser used (if applicable):  OBSystemBrowserAdaptor
>
> Steps to reproduce:
> 1.  In code pane of OBSystemBrowser:
>    a. make a change to the code
>    b. undo the change
>
> The code pane is still marked dirty, even though it has now reverted the
> original.
> --
> View this message in context: http://n4.nabble.com/Issue-2330-BUG-After-undo-ing-all-changes-to-code-shown-in-OBrowser-it-should-not-be-marked-as-dirty-tp2016694p2016694.html
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>
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