Dear Maintainer,

    * What led up to the situation?
On a Debian Bullseye system without librsvg2-common installed, Papirus icons were not correctly displayed.

    * What exactly did you do that was effective?
Install librsvg2-common.

    * What was the outcome of this action?
Icons were correctly displayed.

( This might have been the underlying issue in bug #982901 )

Because it is a dependency of many other packages, librsvg2-common will often already be installed, hiding the dependency from papirus-icon-theme.

gnome-icon-theme depends on, and adwaita-icon-theme recommends librsvg2-common.
As a theme using svg icons, papirus-icon-theme could be expected to depend on, or at least recommend, librsvg2-common too.

Hi,

在 2023-01-17星期二的 13:56 +0900，John Crawley写道：
to some package that provides the SVG parsing functionality (e.g., librsvg2-
common). Such dependency should be handled by whoever *consumes* SVG icons
(e.g., spacefm), not the package that *provides* SVG icons. Why should an icon
theme package know that some random desktop software will need a "librsvg2-
common" to parse SVG correctly? What if that desktop software actually needs
some other SVG parsing library (e.g., libqt5svg5) ? Why *should* I know that?
This does not make any sense.

Back to actual packaging: I could add a recommendation to librsvg2-common, but
I will definitely not opt to go for a hard dependency. I will make the upload
shortly.

Thanks,
Boyuan Yang

We believe that the bug you reported is fixed in the latest version of
papirus-icon-theme, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1029056@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Boyuan Yang <byang@debian.org> (supplier of updated papirus-icon-theme package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Tue, 17 Jan 2023 00:39:56 -0500
Source: papirus-icon-theme
Architecture: source
Version: 20230104-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Deepin Packaging Team <pkg-deepin-devel@lists.alioth.debian.org>
Changed-By: Boyuan Yang <byang@debian.org>
Closes: 1029056
Changes:
 papirus-icon-theme (20230104-2) unstable; urgency=medium
 .
   * debian/control: Recommend installation of librsvg2-common for
     software that needs it to parse SVG icons. (Closes: #1029056)
     See also #982901.
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Thank you for the quick response.

Your argument makes logical sense.

In practice, on a Debian Bullseye system, there are unfortunately many packages which fail to declare the needed dependency. I guess in theory it would be possible to reverse the logic and ask: why should a file manager know what kind of icons it will be asked to display? A hard dependency on an svg rendering library makes as little sense at that end. So where should it be declared?

But anyway, until there's some kind of framework to connect providers and consumers, a Recommends: from papirus-icon-theme will help, and someone assembling a desktop from scratch can add librsvg2-common to the default install list.

Best wishes,
John