[dolphin] [Bug 492660] New: Renaming multiple files removes file extension for unknown file types

[Tarulia]

https://bugs.kde.org/show_bug.cgi?id=492660

            Bug ID: 492660
           Summary: Renaming multiple files removes file extension for
                    unknown file types
    Classification: Applications
           Product: dolphin
           Version: 24.08.0
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: mihawk.90+kdebugs at googlemail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
While renaming some of my media files I noticed that on one specific
combination of files, Dolphin would remove the file extension on one of the
files. I can consistently reproduce this with test files, but on different file
types it seems fine. It *might* have to do with unknown/unassigned file
extensions.

STEPS TO REPRODUCE
1. touch file.idx file.sub
2. Select both files in Dolphin
3. F2 or Right-Click -> Rename
4. Enter a new name, e.g. "test" (no # since there's no counter required)
5. Hit Rename

OBSERVED RESULT
$ ls
test
test.sub

EXPECTED RESULT
Dolphin should keep the file extension in all cases, i.e. correct would be:
$ ls
test.idx
test.sub

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 40 (KDE Spin)
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION
I tried the same with a couple other file extensions:
mkv & mp4 -> fine
log & txt -> fine
jpg & gif
ext1 & ext2 -> would not allow me to rename without adding a counter, when
adding a counter it removes both file extensions
idx & sub (see above) -> idx is an "unknown" filetype i.e. right click brings
up the "Open With…" option, while the sub file is recognised as a text file and
brings up "Open With KWrite"

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