Collapse file paths if there are no intermediate files

[schacon]

In java or kotlin projects, the package structure sometimes leads to deep folders. In this case, abbreviating the depth makes the treeview easier to see.

Example) com.comapny.project.web-application.app

Current tree structure

- com
 - company
  - project
   - web-application
    - src
     - Application.java

You can abbreviate the folder as shown below.

- com.comapny.project.web-application.src
  - Application.java