On Monday June 25 2018 20:57:18 Florian Lindner wrote:

> It seems that setting QT_QPA_PLATFORMTHEME causes the problem, inside Plasma 
> as well as inside i3. However, not setting causes all KDE (5?) application 
> not showing any icons when used inside i3, so it's not an option either.

Yes, that would figure, although there's a trick to avoid that too.

> It was very hard for me to find information about using KDE application 
> outside of Plasma.

That figures, the plasma team guards their work a bit jealously (or at least 
that's the impression one can get).

> How to use the plasma-integration platform theme plugin if not using Plasma5 
> desktop?

Easy: set QT_QPA_PLATFORMTHEME=kde; you should already have the plugin itself 
since you have the Plasma5 desktop stuff installed . It can help if you also 
set KDE_FULL_SESSION=1 and KDE_SESSION_VERSION=5 .
If you do that, KF5 applications should behave as if they're running under a 
Plasma5 desktop. There should be no or almost no drawbacks, because that 
desktop environment isn't required to run those applications. This is exactly 
what I do on a Kubuntu 14.04 machine that still has a good old KDE/Plasma4 
desktop, and I do something similar on my Mac where it is evidently not 
possible to run a full Plasma desktop environment.
>From time to time you may get messages about services that aren't running or 
>found (kactivities, for instance). For the most part those will probably not 
>interest you, if not you can install/run them manually. The most important 
>things (kdeinit5, kded5 and kwalletd5) should get started automatically.

Have fun :)

R.

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