Issue 7455: Side panel tabs get allocated less space after viewing several panels

https://code.google.com/p/fbug/issues/detail?id=7455
Never crop the text of the selected panel tab (related to issue 6534)

https://code.google.com/p/fbug/issues/detail?id=6534
Change the minimum tab width to 60 (related to issue 6534)

https://code.google.com/p/fbug/issues/detail?id=6534
Crop panel tabs from the start (related to issue 6534)

https://code.google.com/p/fbug/issues/detail?id=6534