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[Bug 1756187] [NEW] Some icon themes have missing icons due to missing fallback setting.

To: xubuntu-dev@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1756187@xxxxxxxxxxxxxxxxxx>
Date: Sat, 17 Mar 2018 12:38:30 -0000
Reply-to: Bug 1756187 <1756187@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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To reproduce:

    Install Xubuntu 18.04
    Open Appearance settings -> Icons and set to ubuntu-mono-light
    Open xfce4-settings-manager

Result:

    "Mouse and Touchpad" settings has no icon. The same icon is missing
    in a few other places too.

This affects pretty much any icon theme that does not explicitly inherit
from "gnome", which is quite a lot of themes. It even affects adwaita-icon-theme if you do not have adwaita-icon-theme-full installed too (and -full is not installed by default.)

This is due to some change in the gnome settings. Icon themes can inherit
from other themes. If an icon is still missing then the "hicolor" theme is
checked. However, Gtk+2 and Gtk+3 both also do some undocumented checks.

Gtk+3 is hardcoded to check "Adwaita" and "gnome". "gnome" is where those
missing icons are. But we are not using Gtk+3 yet.

Gtk+2 checks a xsetting called /Net/FallbackIconTheme. This is not set on
either my 16.04 system or my 18.04 system, yet my 16.04 system can find the
missing icons in "gnome". 18.04 however cannot. Setting this key (in
xfce4-settings-editor) fixes the problem. I have not yet figured out why
this was not necessary in 16.04.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xubuntu-desktop 2.223
ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
Uname: Linux 4.15.0-12-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
Date: Thu Mar 15 21:41:54 2018
InstallationDate: Installed on 2018-03-15 (0 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180315)
SourcePackage: xubuntu-meta
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xubuntu-default-settings (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic
-- 
Some icon themes have missing icons due to missing fallback setting.
https://bugs.launchpad.net/bugs/1756187
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