[Bug 2141831] Re: Gtk-WARNING **: Theme parser error: Junk at end of -gtk-icon-filter value: alpha(

[Launchpad Bug Tracker]

This bug was fixed in the package libadwaita-1 - 1.9~beta-0ubuntu2

---------------
libadwaita-1 (1.9~beta-0ubuntu2) resolute; urgency=medium

  * Disable patch:
    stylesheet-common-Use-opacity-for-all-disabled-gtk-images.patch
    While it is syntactically correct in theory, in practice it's triggering
    a bug in libsass which replaces "opacity(" with "alpha(", which
    gtk_css_filter_value_parse() does not understand (LP: #2141831)

 -- Daniel van Vugt <daniel.van.vugt at canonical.com>  Mon, 16 Feb 2026
16:23:22 +0800

** Changed in: libadwaita-1 (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/2141831

Title:
  Gtk-WARNING **: Theme parser error: Junk at end of -gtk-icon-filter
  value: alpha(

Status in gtk4 package in Ubuntu:
  Won't Fix
Status in libadwaita-1 package in Ubuntu:
  Fix Released
Status in libsass package in Ubuntu:
  Won't Fix

Bug description:
  GTK apps are emitting warnings (since libadwaita 1.9~beta?)

  (org.gnome.Nautilus:7873): Gtk-WARNING **: 23:35:52.165: Theme parser error: default-light-yaru-default.css:1:1-7: Expected a filter
  (org.gnome.Nautilus:7873): Gtk-WARNING **: 23:35:52.165: Theme parser error: default-light-yaru-default.css:1:1-7: Junk at end of -gtk-icon-filter value: alpha(

  and

  (gnome-text-editor:14744): Gtk-WARNING **: 23:38:40.302: Theme parser error: default-light-yaru-default.css:1:1-7: Expected a filter
  (gnome-text-editor:14744): Gtk-WARNING **: 23:38:40.302: Theme parser error: default-light-yaru-default.css:1:1-7: Junk at end of -gtk-icon-filter value: alpha(

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