[dolphin] [Bug 471502] New: Icons for folders with preview are different than normal folders

[david]

https://bugs.kde.org/show_bug.cgi?id=471502

            Bug ID: 471502
           Summary: Icons for folders with preview are different than
                    normal folders
    Classification: Applications
           Product: dolphin
           Version: 23.04.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: 12davidkac at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 159928
  --> https://bugs.kde.org/attachment.cgi?id=159928&action=edit
The difference between folders with previews and folders without previews

SUMMARY
When folder preview is enabled, directories with previews look different than
empty ones. It looks like it's using an icon from bigger size and then
downscaling it, making it blurry. See attachment


STEPS TO REPRODUCE
1. Use icon themes like Chicago95 or SE98 with icon size set to 48
2. Have folder previews enabled

OBSERVED RESULT
Folders without previews look as they should, folders with previews are blurry

EXPECTED RESULT
Folders with previews should not be blurry

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.27.6
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.10

ADDITIONAL INFORMATION
Another icon theme issue, not just dolphin specific, is that the icon themes
with both pngs and svgs (like Chicago95) don't look right. In dolphin (also
tested in pcmanfm-qt) PNGs are prioritized, so if the icon theme has a 48x48
directory with .png files and a scalable directory with .svg files, the 48x48
pngs are used and svgs are ignored. You can see this if you set the toolbar
icon size to 64x64. Plasma panel on the other hand prioritizes svgs for all
sizes, ignoring pngs. I don't know where exactly I should post this, so I'll
just leave it here, maybe it's a Qt issue, I'm not sure.

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