SUMMARY
Filelight currently only provides a sunburst view of the used space. However, this visualization is susceptible to misrepresent the used space as the area increases for files/directories further on the outside.
Icicle or treemap charts on the other hand correctly preserve area.

STEPS TO REPRODUCE
1. Create a directory with the following files (of equal size)
[   80]  .
├── [   80]  a
│   ├── [   80]  b
│   │   ├── [   60]  c
│   │   │   └── [ 1.0M]  test
│   │   └── [ 1.0M]  test
│   └── [ 1.0M]  test
└── [ 1.0M]  test
2. Start a filelight scan in this directory

OBSERVED RESULT
The further out instances of the test file have a larger area. When one looks for large files/dirs to delete they intuitively go by area.

EXPECTED RESULT
The displayed area should be directly proportional to the file/dir size.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 39
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.113.0
Qt Version: 5.15.11

ADDITIONAL INFORMATION
- Blog post from the creator of flamegraph.pl (https://github.com/brendangregg/FlameGraph), a popular tool for plotting profiling data, about the pros/cons of different chart types: https://www.brendangregg.com/blog/2017-02-06/flamegraphs-vs-treemaps-vs-sunburst.html
- Similar tools like WinDirStat already use TreeMaps as those properly display the area
- A disadvantage of TreeMaps is that clicking down would either directly jump to the file, or would have to be limited to only go down one directory, there is now "jump down to this directory" as there is currently. Icicle graphs would not have this problem.
- For profiling, icicle graphs (or their upside-down equivalent, flame graphs) are already the prime chart type due to proper area representation which is similarly important when profiling as it is for file system cleanup/analysis.