Hello,
Currently I have to separate different editor tabs/files into logical "groups" by opening additional dummy files in editor (I use side editor tabs, not top ones):

If that's doable, it would be nice to have an ability to group files in your own way (not linked to folder tree), something like this:

User should be able to create/remove groups and drag-n-drop files between them.
This will greatly improve usability of MatLAB editor. Unfortunately, I don't know Java at all to implement it myself...
If those groups will have an ability to be collapsed, that would be great!
If not, having groups still will bring some cleanness to large projects.