[dolphin] [Bug 440712] New: Dolphin should automatically regenerate subfolder thumbnails after dropping files into them

[Nagy Tibor]

https://bugs.kde.org/show_bug.cgi?id=440712

            Bug ID: 440712
           Summary: Dolphin should automatically regenerate subfolder
                    thumbnails after dropping files into them
           Product: dolphin
           Version: 21.04.3
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: xnagytibor at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 140573
  --> https://bugs.kde.org/attachment.cgi?id=140573&action=edit
Reproduction

SUMMARY
When drag and dropping thumbnailable files into subfolders, Dolphin doesn't
automatically regenerate the subfolder thumbnails. This can make non-empty
folders appear as empty until the file list is manually refreshed. I'm
reporting this bug because it has spooked me for a second thinking I lost my
files while cleaning up my home folder.

STEPS TO REPRODUCE
1. Enable folder thumbnails at "Configure Dolphin..." -> "General" ->
"Previews" -> "Folders"
2. Create a new empty folder.
3. Drag and drop some thumbnailable files into that folder.
4. Check that subfolder's icon. It doesn't show any thumbnails on the subfolder
icon. Here's the bug.
5. Manually refresh the file view by pressing F5 or by navigating away and
back.
6. After a manual refresh Dolphin now shows how the subfolder icon should have
looked like after Step 4.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.22
KDE Plasma Version: 5.22.4
KDE Frameworks Version: 5.84.0
Qt Version: 5.15.3
Kernel Version: 5.11.0-25-generic (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i3-5010U CPU @ 2.10GHz
Memory: 7.7 GiB of RAM
Graphics Processor: GeForce 920M/PCIe/SSE2

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