[dolphin] [Bug 423537] hold N previews in memory (i.e. multi-level preview caching)

[Harald Sitter]

https://bugs.kde.org/show_bug.cgi?id=423537

--- Comment #2 from Harald Sitter <sitter at kde.org> ---
(In reply to Elvis Angelaccio from comment #1)
> > At the best of times that will simply result in the job poking the thumbnailer and the thumbnailer reading the cache file from disk, over and over again
> 
> What's wrong with this? Repeated disk access?

Repeated disk access. But also general speed. When going up and down a dir
structure there's a noticeable delay in the same thumbs appearing. I'm sure
part of it is KIO's fault though (as per the bugs below).

> > At the worst of times the previewable content has caching disabled entirely (Text thumbs, directory thumbs) 
> 
> Can't we enable caching for those?

https://bugs.kde.org/show_bug.cgi?id=423541
https://bugs.kde.org/show_bug.cgi?id=423736
https://bugs.kde.org/show_bug.cgi?id=423538

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