Bug 499820

Summary: Some thumbnails with preview are showing in smaller size
Product: [Applications] dolphin Reporter: Stabilizer1071
Component: generalAssignee: Dolphin Bug Assignee <dolphin-bugs-null>
Status: RESOLVED FIXED    
Severity: normal CC: andreas.hencke, bugs, dolphin-bugs-null, edjelvis, garirry, johan.claudebreuninger, kyliepc, lukeh, smowtenshi
Priority: NOR    
Version First Reported In: 24.12.2   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: Thumbnails under home directory

Description Stabilizer1071 2025-02-11 16:30:37 UTC
Created attachment 178150 [details]
Thumbnails under home directory

SUMMARY
After enabling the "Show Thumbnails" feature, in some folders (especially the home directory), the icons for files/folders that can generate thumbnails appear smaller than regular icons without thumbnails, while other folders remain normal. The bug was likely introduced in versions 24.12.1-1 or 24.12.2-1. Both of my KDE devices exhibit the same issue, with one having remained unupdated for a long time and encountering the bug after today's update.

STEPS TO REPRODUCE
1.Enable the "Show Thumbnails" option in KDE Dolphin.
2.Navigate to a folder containing a mix of files/folders that can generate thumbnails (e.g., images, videos) and those that cannot (e.g., plain documents). The issue is most noticeable in the home directory.

OBSERVED RESULT
Files/folders capable of generating thumbnails (e.g., images) display smaller icons compared to regular files/folders without thumbnails.

EXPECTED RESULT
All files/folders, regardless of thumbnail availability, should maintain consistent icon sizes when the "Show Thumbnails" feature is enabled.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
None
Comment 1 lukeh 2025-02-14 02:39:19 UTC
I've been able to reproduce this by creating a symlink to a folder which has thumbnail previews. The thumbnail of the symlinked folder will be smaller than other icons.
Comment 2 Kye 2025-02-14 12:26:13 UTC
Can replicate with the above steps.
Comment 3 Sylens 2025-02-14 17:59:35 UTC
Confirmed! I also observed this a few days ago on tons and tons of my symbolic links were scaled wrongly (which are not under my home folder but on separate HDDs) - I work with a lot of media files, and this bug is quite annoying
Comment 4 Elvis Douglas Janegitz 2025-02-15 23:27:26 UTC
Same thing here with EndeavourOS.
Comment 5 johan.claudebreuninger 2025-02-27 00:37:55 UTC
I can also replicate this bug.

System:

Operating System: Arch Linux 
KDE Plasma Version: 6.3.1
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.4-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i5-10500T CPU @ 2.30GHz
Memory: 15.3 Gio of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
Manufacturer: LENOVO
Product Name: 11DQS02700
System Version: ThinkCentre M80q
Comment 6 johan.claudebreuninger 2025-03-06 00:52:14 UTC
I believe https://bugs.kde.org/show_bug.cgi?id=500085 is a duplicate of this one.
Comment 7 Stabilizer1071 2025-03-07 08:22:15 UTC
Version 24.12.3-1 fixes it for me. Thanks to all devs for their efforts!
Comment 8 Andreas Hencke 2025-03-07 08:59:23 UTC
I can confirm it, version 24.12.3-1 (Arch) fixed it. Thank you all.
Comment 9 johan.claudebreuninger 2025-03-07 19:34:05 UTC
I can also confirm the fix on Arch