Nautilus, double method selection, FTTable and needToggleAtMouseUp

Hi all,

I was checking issue 17563:

https://pharo.fogbugz.com/f/cases/17563/Method-rename-refactoring-does-not-update-affected-methods-in-current-browser

And I saw that the bug could be produced by some change in FTTable,
particularly related to the introduction of the needToggleAtMouseUp
variable, that caused duplicated events.

I did a better presentation of the bug in the issue tracker.

Can somebody give a hand in here? I have not enough experience in fast
table to see if my intuition on the solution is good or is completely
wrong :).

Tx,
Guille