GTK theming is currently unstable and their css handling is changing
between series so using the system theme wouldn't work great in
practice, a snap of a GTK > 3.19 software wouldn't look right on an host
using GTK 3.18

Options:
- use the host theme via an interface, but then you get the issue if the GTK 
versions mismatch

- have applications to bundle and force one theme, but the result is
that they would not look integrated to the desktop environment they are
used on

- have applications to bundle themes for the different desktops and
somewhat smart select the one to use ... that's probably not something
an upstream wants to have to do since it would require to keep up with
the envs existing out there and what theme they use

- invent a smart theme interface where you get a snap with a collection
of themes and the one shared with your snap is selected somehow
depending on the toolkit (+version) and desktop theme you are using

- other?


I think ideally we need the smartness, unsure how it could work exactly though

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https://bugs.launchpad.net/bugs/1585332

Title:
  Graphical snaps don't follow the window theme

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