[dolphin] [Bug 495214] New: A filename whose length equals NAME_MAX cannot be moved to wastebin, because appending `.trashinfo` causes the resulting filename to exceed that value

[Roke Julian Lockhart Beedell]

https://bugs.kde.org/show_bug.cgi?id=495214

            Bug ID: 495214
           Summary: A filename whose length equals NAME_MAX cannot be
                    moved to wastebin, because appending `.trashinfo`
                    causes the resulting filename to exceed that value
    Classification: Applications
           Product: dolphin
           Version: 24.08.2
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: 4wy78uwh at rokejulianlockhart.addy.io
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 175124
  --> https://bugs.kde.org/attachment.cgi?id=175124&action=edit
Screenshot of the dialog window.

SUMMARY
-------

Filenames at the 255-character limit (as defined by `NAME_MAX` in
`file:///usr/src/linux-headers-2.6.38-10/include/linux/limits.h`) cannot be
moved to the wastebin by appending `.trashinfo`, because the resultant filename
exceeds `NAME_MAX`. Consequently, this situation needs to be specially handled
by Dolphin, by:

1. Solely providing the "Delete" option, which is unintuitive and dangerous UX.
2. Prompting the user to manually reduce the filename before it can be moved to
the wastebin. This shall be problematic for multiple filenames, because not
everyone knows how to use KRename.
3. Automatically reducing the filename, and storing the original name in a
sidecar file. This is the best option, because the user shouldn't be manually
interacting with `$HOME/.local/share/Trash/` outside of `trash:/` anyway.

STEPS TO REPRODUCE
------------------

1. Name a file
`!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!`.
2. Attempt to send that file to the wastebin via Dolphin's context menu entry.

OBSERVED RESULT
---------------

It fails, with a nondescript error. See the attached screenshots.

EXPECTED RESULT
---------------

As aforementioned.

SOFTWARE/OS VERSIONS
--------------------

> ```YAML
> Operating System: Fedora Linux 40
> KDE Plasma Version: 6.2.1
> KDE Frameworks Version: 6.7.0
> Qt Version: 6.7.2
> Kernel Version: 6.11.4-201.fc40.x86_64 (64-bit)
> Graphics Platform: Wayland
> Processors: 12 × AMD Ryzen 5 7600X 6-Core Processor
> Memory: 30.4 GiB of RAM
> Graphics Processor: AMD Radeon RX 5700
> Manufacturer: ASRock
> Product Name: X670E Taichi
> ```

ADDITIONAL INFORMATION
----------------------

Obviously, it's a very, very niche situation. Noticed when filing
https://github.com/darkreader/darkreader/issues/13410#issue-2606658084.

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