[dolphin] [Bug 477298] Dolphin hangs when navigating to a directory with any JSON files in it

[Metz]

https://bugs.kde.org/show_bug.cgi?id=477298

--- Comment #5 from Metz <metzelketzer at gmail.com> ---
I thought as well disabling previews / thumbnails would help since it looked
like it was kioslave5 `thumbnail.so` that was eating extreme amounts of memory
and taking everything down. however, now instead of only the folders with a
.json in it not working, now no folder works and right now i basically
completely lost access to dolphin.

however, for testing i created a second user on my system and after login i
noticed everything works perfectly fine. no problems with dolphin whatsoever.
which i tbh can not really explain since obviously both accounts use the same
software versions. so the only difference can be in the configuration of those,
but the only change on the main account between working and non-working state
was the installation of "appimagelauncher" which brings libappimage and
squashfuse with it. since the first is used by `kio-extras` to handle appimage
thumbnails it is imho a suspect. but removing it did not fix it.

and i'm unable to reproduce the problem on a second account so i'm at a loss
here what caused it. the last major system update was 22. November, 6 days
before i started to notice problems, so as a daily user i have a hard time
believing it was caused by something there. it is however consistent with OPs
report date. the only other update inbetween, 3 days before the problems was
lib32-libxml2, libxml2 and mawk.

i also run mesa-git which updates daily. which i thought may be a factor. but
downgrading to stable (1.23.1.9) had no effect.

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