What types of things do you run in your OS that you think would be useful to group like this?
Also, I once set up KDE 4 to put different apps into tabs of a single window. I'm not sure if KDE 5 can still do that, but it sounds like something that you would be interested in.
> now that I have a nice powerful machine.
You're going to love KDE 5, if your last experience with KDE was back in the early 4 days when it was a memory and CPU hog. Today I don't even notice it at all. Just be sure to disable the File Search feature in System Settings. And it really is called File Search now, not some cryptic name that changed every other version.Is it possible to have nested subfolders?
This could be for browsers (tabs in [project] in [work]). Also in spreadsheets (Excel Sheets inside folders - anyone from Microsoft here?). Also in music (iTunes has playlist folders!). Also in Contacts (people in [social group] in [country]).
The way I imagine the user interface is similar to existing tabs or bookmarks, but with a drop-down menu, and to be able to easily access all sub-items by clicking the folder.