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I prefer showing package as tree in Project dialog, but I have one small idea how it would be much more better. What about combine it with list mode for empty folder. Often it's structure of project this: org.company.project.module All folders org, company, project is empty, only module folder contains source code. When I need source code I must open many empty folder. What about join all empty folder to one tree item? It will be seem as: cz.atomsoft.project.module1 core File1 File2 gui ... database ...
It's nice but needs separate mode not the tree mode, the tree mode is designed to be as cheap as possible, designed for people with sources on NFS. In this case the view will neeed to do recursive list to find out the empty folders.
It's not problem, can be as 3rd mode. But I think that this much useful that all present mode. People which know InelliJ IDEA will be agree with me. IDEA also remember open/closed nodes.
I'm added another feature request related to this: ISSUE #147183
I think, this can save a lot of time. Use list view is very confused when project has much packages. Tree is better, but I must open very much empty folder which contains only one next package. Create new mode which combine booth existing would be great. (And store open/close status for every node when I run Netbeans again.)
*** This bug has been marked as a duplicate of bug 53192 ***