[kio-extras] [Bug 364253] New: Inconsistent icons for thumbnails compared to normal icons in Dolphin

[Martin Sandsmark via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364253

            Bug ID: 364253
           Summary: Inconsistent icons for thumbnails compared to normal
                    icons in Dolphin
           Product: kio-extras
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: NOR
         Component: default
          Assignee: plasma-devel at kde.org
          Reporter: martin.sandsmark at kde.org

If running Dolphin without the plasma-integration platform plugin, the icons
for folders are different from the icon used for the thumbnails.

I tried tracking it down, and I got as far as to figuring out that the
difference is that the "normal" (non-thumbnail) icons are resolved with QIcon,
while the thumbnailer in kio-extras uses KIconLoader.

When using the plasma-integration platform plugin QIcon uses KIconLoader
indirectly, but when using any other plugin it uses some default loader backend
in Qt. I tried looking at why this doesn't load the same icon as KIconLoader
(it seems to load for the wrong size, for some reason).

While this is a bug in Qt, KIconThemes or the Breeze icon set (specifying
something wrong in the .desktop files?), I haven't seen this bug surface
anywhere else. And I think it makes sense to "normalize" kio-extras to use
QIcon as well, when running under plasma it will still use KIconLoader
indirectly.

Reproducible: Always

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