[dolphin] [Bug 421869] New: Natural sorting does not sort shorter filename first when another one have underscore

[Eric Hoffman]

https://bugs.kde.org/show_bug.cgi?id=421869

            Bug ID: 421869
           Summary: Natural sorting does not sort shorter filename first
                    when another one have underscore
           Product: dolphin
           Version: 19.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: ehoffman at videotron.ca
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
First, this is not the same as 420555 (I have found that too and saw the bug
report for it).

When you have natural sorting enabled, Dolphin will not list the shorter file
before a longer one if the longer one have an underscore at the position of the
shorter file dot.

For example, I have files:
- file.txt
- file_with_underscore.txt

In natural mode, Dolphin will list them as

- file_with_underscore.txt
- file.txt

In alphabetical mode, it will list them in 'correct' order.

STEPS TO REPRODUCE

- Have sorting set to 'natural mode' (note that you must take care of bug
420555, which require you to re-open the config dialog if you changed the
setting)
- Create 2 files in a directory, named "file.txt" and
"file_with_underscore.txt"

OBSERVED RESULT

You see:
- file_with_underscore.txt
- file.txt

EXPECTED RESULT

Should discard extension part when comparing file names, as in alphabetical
sort mode, or more specifically, as you get when you do ls -l with
LC_COLLATE=C.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 20.04
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8

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