[konsole] [Bug 497519] New: Konsole Flatpak inserts an unexpected penultimate argument when the start command includes more than just the program

[Anael]

https://bugs.kde.org/show_bug.cgi?id=497519

            Bug ID: 497519
           Summary: Konsole Flatpak inserts an unexpected penultimate
                    argument when the start command includes more than
                    just the program
    Classification: Applications
           Product: konsole
           Version: 24.12.0
          Platform: Flatpak
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: anael at anael.es
  Target Milestone: ---

SUMMARY
Since https://invent.kde.org/utilities/konsole/-/merge_requests/830, the
argument “--env=TERM=xterm-256color” is appended as the last but one argument
in Konsole's start command.
This is not noticeable by default, because the start command is just the shell
(e.g. /bin/bash);
being annexed to flatpak-spawn instead, as intended.
However, if the user passes one or more args, the TERM env variable will be
passed to the start command (be it the shell or something else) instead of
flatpak-spawn.

STEPS TO REPRODUCE
1. Open a terminal or KRunner
2. Run `flatpak run org.kde.konsole --hold -e /bin/echo Example`

OBSERVED RESULT
Konsole shows “--env=TERM=xterm-256color Example“, because
--env=TERM=xterm-256color was passed as an argument.

EXPECTED RESULT
Konsole should show just “Example”.
“--env=TERM=xterm-256color” should be passed to flatpak-spawn and not the
user-provided command.

SOFTWARE/OS VERSIONS
Konsole Version: 24.12.0
Operating System: Fedora Linux 41
Flatpak runtime: org.kde.Platform/x86_64/6.8
KDE Frameworks Version: 6.8.0 (6.9.0 inside the runtime)
Qt Version: 6.8.0

ADDITIONAL INFORMATION
This behaviour prevents me from using Konsole as a Flatpak with my current
profile.
When I launch the Konsole Flatpak with a custom command:

```
[General]
Command=/bin/bash --init-file $HOME/.local/share/bash/bashrc
```

Konsole closes immediately upon launch. If launched with the --hold option,
bash gives the following error:
line 11: return: can only `return' from a function or sourced script.

I discovered afterwards that the real command that was being executed was:
/bin/bash --init-file --env=TERM=xterm-256color $HOME/.local/share/bash/bashrc

If any arguments besides the shell/program binary are provided, Konsole will
always append “--env=TERM=xterm-256color” before the last argument.

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