From e2343fd7ffb802db34bb487032d31bbea304c4db Mon Sep 17 00:00:00 2001
From: Paul Menzel <pmenzel@molgen.mpg.de>
Date: Wed, 14 Oct 2026 14:13:37 +0200
Subject: [PATCH] cursor-theme: Make the default cursor theme inherit Adwaita
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In a COSMIC session (cosmic-comp 1.9.0) the cursor icon for resizing with
corners are missing, and with Firefox 157 as native Wayland client, the
mouse cursor shrinks when it moves over a Firefox window. The user journal
show cosmic-comp logging:

    Unable to load xcursor, using fallback cursor err=NoDefaultCursor

Neither XCURSOR_THEME nor the GTK setting cursor-theme is set, so
cosmic-comp (xcursor crate), GTK (libwayland-cursor), and X11 clients
(libXcursor) all look up the cursor theme named “default”. MarIuX has no
`/usr/share/icons/default`, and no bee package owns that path. So each side
falls back to its own built-in arrow: cosmic-comp draws its 64×64 fallback
image (visible arrow 21×31 px, `src/backend/render/cursor.rs`, lines 85–112
at epoch-1.9.0), while libwayland-cursor in Firefox draws the classic X11
core cursor (8×14 px).

Install `cursor-theme/index.theme` as
`$usr_prefix/share/icons/default/index.theme`, making the theme “default”
inherit Adwaita, whose cursors are already installed in
`/usr/share/icons/Adwaita/cursors` (adwaita-icon-theme-3.34.0-1). None of
the three libraries searches `/etc`, but all of them search
`/usr/share/icons`. Debian does the same, there via the alternative
x-cursor-theme. As the cursor theme is site policy, put it into mxtools
like `applications-defaults/defaults.list`.

Tested on *machdoch* with a nested cosmic-comp (COSMIC_BACKEND=winit on
Xvfb) and Firefox, with the same file found through

    XCURSOR_PATH=$W/icons:/usr/share/icons:/usr/share/pixmaps

The fallback warning is gone. Firefox now shows the Adwaita arrow
(15×21 px), and cosmic-comp the Adwaita resize cursor at the window border.

Link: https://specifications.freedesktop.org/icon-theme-spec/latest/
Assisted-by: claude-opus-5.5 (Claude Code)
---
 cursor-theme/index.theme | 2 ++
 install.sh               | 1 +
 2 files changed, 3 insertions(+)
 create mode 100644 cursor-theme/index.theme

diff --git a/cursor-theme/index.theme b/cursor-theme/index.theme
new file mode 100644
index 00000000..cda0b19a
--- /dev/null
+++ b/cursor-theme/index.theme
@@ -0,0 +1,2 @@
+[Icon Theme]
+Inherits=Adwaita
diff --git a/install.sh b/install.sh
index 1ff39652..071400ae 100755
--- a/install.sh
+++ b/install.sh
@@ -188,6 +188,7 @@ install_data logrotate/logrotate.conf                     "$DESTDIR$sysconfdir/l
 install_data logrotate/logrotate.service                  "$DESTDIR$systemdunitdir/logrotate.service"
 install_data logrotate/logrotate.timer                    "$DESTDIR$systemdunitdir/logrotate.timer"
 install_data applications-defaults/defaults.list          "$DESTDIR$usr_prefix/share/applications/defaults.list"
+install_data cursor-theme/index.theme                     "$DESTDIR$usr_prefix/share/icons/default/index.theme"
 install_data crashkernel/crashkernel.service              "$DESTDIR$systemdunitdir/crashkernel.service"
 install_exec crashkernel/crash-recovery.sh                "$DESTDIR$root_sbindir/crash-recovery.sh"
 install_exec checktrust/checktrust                        "$DESTDIR$usr_sbindir/checktrust"