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As I work I use folding to "hide" functions that I'm not working on. Saving the project and reload it later does not save also the functions that I have fold, so I need to do the job again. I believe that it will quite nice to have this feature.
You may also use custom folding marks: // <editor-fold defaultstate="collapsed"> ... // </editor-fold> to collapse a portion of code as a workaround *** This bug has been marked as a duplicate of bug 188573 ***