[dolphin] [Bug 497671] New: Dolphin should remove old/unused thumbnails to avoid too high disk space usage

[Petr N.]

https://bugs.kde.org/show_bug.cgi?id=497671

            Bug ID: 497671
           Summary: Dolphin should remove old/unused thumbnails to avoid
                    too high disk space usage
    Classification: Applications
           Product: dolphin
           Version: 22.12.3
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: bugs.kde.org.shine600 at passinbox.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY

Thumbnail cache (du -h ~/.cache/thumbnails|sort -h)
can grow to around 10GB+ https://forums.debian.net/viewtopic.php?t=154081

by default "keep only thumbnails for the folders visited in last 3 months and
remove rest"

"this really ought to be a configurable setting/feature with Dolphin"

Impact:
1. cleanup thumbnails for files that no longer exist.
2. avoid taking too much disk space for the files that are not really used in
months

Maybe the cleanup can be done if the drive usage exceeds some threshold like
80% or regularly, but rarely (during shutdown etc.) not to cause slowdowns due
to too many IO operations.

Some file systems/mountpoints does not use atime.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian 12, all stable
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8

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