Use the system gtk theme

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Justification on asking for news:

@niemeyer

The work on themes was parked for a while waiting on the improvements that are happening on the mount backend, which underpins improvements happening in the content interface and most importantly the upcoming layouts feature.

With these latter pieces landing, themes will be unblocked. The very first version of the feature will leverage a single snap containing a number of common themes which can be used as the default-provider in content interfaces in client applications. This is easy to do and will get us good looking applications in the short term.

Layouts landed in 2.32 (10th April) according to the snapd roadmap, I think the ‘improvements happening in the content interface’ is referring to ‘Auto install of content snap dependencies’? That latter feature also landed in 2.32. I’m sure I’ve seen some work on the forum for application themes but I don’t remember where and it should be linked to in this topic!