*** This bug is a duplicate of bug 217997 ***
https://bugs.launchpad.net/bugs/217997
This is a compound bug, and to fix it either Glib or update-mime-
database need to be modified. Here is the relevant snippet from
glib2.0-2.18.1/gio/gcontenttype.c, function g_content_type_get_icon:
if (xdg_mimetype_icon)
icon_names[n++] = xdg_mimetype_icon;
icon_names[n++] = mimetype_icon;
icon_names[n++] = legacy_mimetype_icon;
icon_names[n++] = generic_mimetype_icon;
The problem is, xdg_mimetype_icon is NULL only if there is no generic
icon defined. It looks for icon names in /usr/share/mime/icons, but this
file is empty when generated using current update-mime-database (this
might not be a bug - maybe the icons file is a legacy feature, I don't
know), so it always contains the generic icon name. mimetype_icon is the
specific icon name created by replacing slashes with hyphens in the
mimetype name. legacy_mimetype_icon is the gnome-mime- variant.
generic_mimetype_icon is the first part of the mimetype before slash
(e.g. application) with -x-generic appended.
The correct order is therefore:
icon_names[n++] = mimetype_icon;
icon_names[n++] = legacy_mimetype_icon;
if (xdg_mimetype_icon)
icon_names[n++] = xdg_mimetype_icon;
icon_names[n++] = generic_mimetype_icon;
because mimetype_icon and legacy_mimetype_icon are the most specific
names. However, if the /usr/share/mime/icons file is supposed contain
icon names for all mimetypes, this is a bug in update-mime-database, and
the aforementioned Glib code is correct.
--
Generic mimetype icons override specific icons in the same theme
https://bugs.launchpad.net/bugs/278113
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