class selection is lost when browsing a method in and switching in hierarchy mode

Hi

I have the impression that I found an really annoying glitch.
- Take a class hierarchy in the middle
- Select a class side method
- Select the hierarchy buttong
- normally the class you selected and (the class of the currently  
displayed is not selected anymore).

https://pharo.fogbugz.com/f/cases/19828/Class-side-methods-hierarchy-selection-eats-the-selected-class


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