I maybe missing a setting, otherwise this would be a nice feature.
Is it possible for the RubyMine to remember the (not sure what to call it) Tree View expansion (what you have expanded)? I really like that RubyMine remembers what files you had open, the tab order and which one is selected (that helps a lot - thanks). It gets tedious to always open up (say) 'controllers' and 'views' every time I open the project. If RubyMine remembered what I had expanded in the explorer it would be really cool - if there's not already some way to do that?