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One of my biggest pet peeves is that Netbeans is when I'm working on a new feature, and have to switch from the feature branch back to the maint (specifically in git, but this would apply in any vcs). Any files added in the branch are closed, since they no longer exist. This makes sense, but it would be extremely handy to have it remember open files by branch, and reopen ones that were open last time you edited that branch. My current work-around is to close NB, checkout the maint, open a different version of NB or vim to do my edits, commit, re-checkout my feature branch, and then open NB back up.