[filelight] [Bug 480067] New: Add icicle or treemap visualization

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https://bugs.kde.org/show_bug.cgi?id=480067

            Bug ID: 480067
           Summary: Add icicle or treemap visualization
    Classification: Applications
           Product: filelight
           Version: unspecified
          Platform: Other
                OS: All
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: nilskemail+kde at gmail.com
                CC: martin.sandsmark at kde.org
  Target Milestone: ---

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.

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