[kde] [Bug 508749] New: Massive issues with filenames not in UTF-8

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https://bugs.kde.org/show_bug.cgi?id=508749

            Bug ID: 508749
           Summary: Massive issues with filenames not in UTF-8
    Classification: I don't know
           Product: kde
      Version First unspecified
       Reported In:
          Platform: openSUSE
                OS: Linux
            Status: REPORTED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: office at hantsch.co.at
  Target Milestone: ---

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SUMMARY


STEPS TO REPRODUCE
1. Do a plain install of "openSUSE Leap 15.6"  (this also applies to older
versions, so version is not so important, I think)
2. Install all official updates, too.
3. Enter YaST2 -> System -> Language 
    Select there "Primary Language = German", then click "Details" and  UNCHECK
 UTF-8 Encoding.
    Store settings and reboot system.   (System is now using     de_DE at euro )
4. In former runlevel 3   the system shows now locales set to de_DE at euro
everywhere, and everything is running fine.
5. In KDE I have to configure the profile of XFREE -> Extended ->
Default-Char-Encoding to ISO-8859-15. otherwise the konsole still encodes in
UTF-8.
   I also have to edit ~/.config/plasma-localerc   and enter there de_DE at euro
instead of  de_DE.UTF-8

Now everything is set to iso-8859-1[5]


OBSERVED RESULT
KDE shows filenames containing German Umlauts garbled.    
Example:  a filename   "würde.txt"   appears as   "w<?>rde.txt" in Dolphin.  
("<?>" is one character)

Trying to open the file (containing the string  "Hallo, schöne Welt") opens an
empty file (because kate receives a faulty filename, it starts a new file)

Renaming the filename "würde.txt" -> "wuerde.txt"   makes kate open the file.
kate correctlöy shows encoding ISO-8859-15 and shows the string correctly, so
the problem is only related to the filename.

EXPECTED RESULT
I would expect that KDE is able to correctly detect the locale setting of
Linux. If this is not UTF-8, it shall also use a character translation.
I do not care about how KDE is internally working. if it internally uses only
UTF-8, it has to convert filenames between locale settings and UTF-8 as a step
in between. This fix was always possible in all previous versions of KDE (but
not done by me).


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

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