Just installed GIMP 2.10 on Ubuntu 18.10 using the SNAP version of communitheme. There seems to be an issue with any of the themes, something is breaking.
I have gtk2-engines-pixbuf installed.

There seems to be an issue with any of the themes, something is breaking.
Do you mean that this is reproducible with Adwaita and Ambiance as well?
@giovannicaligaris did you install the snap app or the.deb?

I don't have this issue with both communitheme and gimp installed as a snap in my VM
I installed the deb
I cannot reproduce this either. I installed GIMP with both ppa and flatpak and everything seems OK
Turns out I have the same issue. Installed from flatpak.

This is weird
What's even weirder: I've installed it few weeks ago via GIMP website. Problem is I don't know how to remove it now because it does not appear in the Software Center as installed :-/
it should be something like flatpak remove com.org.GIMP
Okay guys:
Did you noticed @giovannicaligaris is talking about Ubuntu 18.10?
My VM is 18.10!
I've removed flatpak version (thanks @clobrano) and installed snap version. The issue is no longer here for me.
We still don't know if this only happened with communitheme :man_shrugging:
For me it is only in Ubuntu snap but not only with communitheme.
When logging in to Ubuntu all is well with Dark Gimp. (Adwaita-Dark).
My Gimp installed as .deb.
This might be still the problem to those who install the ,deb.
I just run the workaround command and it also solved my synaptic not being themed but the Gimp still looks half themed.
https://github.com/ubuntu/gtk-communitheme/issues/358
Weird, the workaround should already be in master
Weird indeed! - Maybe @didrocks can help us out in this confusion?
I guess ensure you don't have the communitheme deb, but only the snap, and any local version of communitheme installed manually on the system. As this isn't reproducible on a fresh system, it's probably an user configuration due to some of this on the impacted system
Closing this then
@clobrano ,
I see @didrocks reply only now. In my case there is no deb of communitheme on my system but it is an upgraded 18.04 from 17.10 32 bit so maybe there is something like that but I don't know where to look for the culprit. any suggestions? Thanks!
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I guess ensure you don't have the communitheme deb, but only the snap, and any local version of communitheme installed manually on the system. As this isn't reproducible on a fresh system, it's probably an user configuration due to some of this on the impacted system