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Automatically installing Gtk themes in Flatpak by tingping

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utopian-io · @tingping · (edited)
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Automatically installing Gtk themes in Flatpak
In order for Flatpak'd applications to integrate with the system they require having themes installed but sadly this has always been a manual process. Thankfully Flatpak has a feature for basic conditional statements in runtimes for automatically downloading or enabling extensions if a condition is met. These conditions are [defined within flatpak itself](https://github.com/flatpak/flatpak/blob/c60b5d7e7c63a12fccb92b7f1fcafc81afde2930/common/flatpak-utils.c#L4238-L4279) so I added `active-gtk-theme`.

This condition currently pulls from [DConf](https://en.wikipedia.org/wiki/Dconf) looking up the `gtk-theme` key in the `org.gnome.desktop.interface` schema which is set automatically by GNOME and thanks to [a recent addition](https://bugs.kde.org/show_bug.cgi?id=387417) KDE.

On other platforms it would be necessary to pull the information from [XSettings](https://specifications.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html) but that is sadly a non-trivial protocol and would likely mean a dependency on xlib which is not desired so has not been implemented at this time.

Once the condition is met at `update` or `install` time `flatpak` will automatically install matching extensions.

Merge request: https://github.com/flatpak/flatpak/pull/1181 and 
 https://github.com/flatpak/freedesktop-sdk-images/pull/60

<br /><hr/><em>Posted on <a href="https://utopian.io/utopian-io/@tingping/automatically-installing-gtk-themes-in-flatpak">Utopian.io -  Rewarding Open Source Contributors</a></em><hr/>
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@dutch · 
Thank you for the contribution. It has been approved.

I will accept this work. However, in future if you are submitting very small contributions you should merge 2 or 3 pull requests to submit in the development category.

You can contact us on [Discord](https://discord.gg/UCvqCsx).
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