[dolphin] [Bug 457581] New: [non-KDE] no icons unless a theme is explicitly configured

[Hugo Osvaldo Barrera]

https://bugs.kde.org/show_bug.cgi?id=457581

            Bug ID: 457581
           Summary: [non-KDE] no icons unless a theme is explicitly
                    configured
           Product: dolphin
           Version: 22.04.3
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: hugo at whynothugo.nl
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 151160
  --> https://bugs.kde.org/attachment.cgi?id=151160&action=edit
Screenshot of what dolphin looks like out-of-the-box

SUMMARY

When running dolphin on a non-KDE setup (in my case, swaywm), dolphin will
render no icons by default.

This is kind of a "known issue", and Arch's wiki describes a workaround:
installing qt5ct, picking an icon theme and then setting an environment
variable whenever running Dolphin.

While the workaround works, it provides a very poor out-of-the-box experience.
If a user has not explicitly chosen an icon theme, using _any_ icon theme would
be better than none. The initial impression is otherwise very poor, and even
using the wrong icons would give a better impression (those not using KDE
shouldn't be surprised by a theme mismatch anyway).

OBSERVED RESULT

All icons are blank. See screenshot.

EXPECTED RESULT

Render using any icon theme..

SOFTWARE/OS VERSIONS
Linux: Linux 5.19.0-rc7-asahi-2-1-ARCH aarch64 GNU/Linux
KDE Plasma Version: this issue is specific to non-KDE setups
Qt Version: qt5-base is 5.15.5+kde+r174-1, though this is not a new issue at
all

ADDITIONAL INFORMATION

It's possible the issue at hand is not Dolphin-specific an actually in some
dependency/framework that's in use here. If so, please let me know which
component that is and I can report to the correct place.

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