[dolphin] [Bug 413660] New: Natural sorting not working as documented

[Werner Lehmann]

https://bugs.kde.org/show_bug.cgi?id=413660

            Bug ID: 413660
           Summary: Natural sorting not working as documented
           Product: dolphin
           Version: 19.04.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: wl at dm17.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Natural sorting does not sort numbers in filenames (anymore?). The example in
the Dolphin manual does not work like documented.

STEPS TO REPRODUCE
1. Enable natural sorting.
2. In a test folder, create test files: "touch File1 File2 File10"

OBSERVED RESULT
Regardless of selected sort order in Dolphin preferences, files are always
sorted like this:
File1
File10
File2

EXPECTED RESULT
In natural sort order, files are sorted like this:
File1
File2
File10


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 19.10 with Plasma backports
KDE Plasma Version: 5.17.2
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.4

ADDITIONAL INFORMATION
The reproducible example is taken from the Dolphin manual, see
https://docs.kde.org/stable5/en/applications/dolphin/configuring-dolphin.html

See also the result of ls with -v option:

$ ls -v
File1  File2  File10

$ ls 
File1  File10  File2

Reading other bugs I realize that this may be related to locale. This is my
locale info:

LANG=en_US.UTF-8
LANGUAGE=en_US:de
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=de_DE.UTF-8
LC_TIME=de_DE.UTF-8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=de_DE.UTF-8
LC_MESSAGES=POSIX
LC_PAPER=de_DE.UTF-8
LC_NAME=de_DE.UTF-8
LC_ADDRESS=de_DE.UTF-8
LC_TELEPHONE=de_DE.UTF-8
LC_MEASUREMENT=de_DE.UTF-8
LC_IDENTIFICATION=de_DE.UTF-8
LC_ALL=

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