gnome: add `jxl` thumbnails and wallpapers support

pkgs/desktops/gnome/core/gnome-control-center/default.nix

@@ -31,6 +31,7 @@
 , libgudev
 , libadwaita
 , libkrb5
+, libjxl
 , libpulseaudio
 , libpwquality
 , librsvg
@@ -173,10 +174,11 @@ stdenv.mkDerivation (finalAttrs: {
   '';
 
   postInstall = ''
-    # Pull in WebP support for gnome-backgrounds.
+    # Pull in WebP and JXL support for gnome-backgrounds.
     # In postInstall to run before gappsWrapperArgsHook.
     export GDK_PIXBUF_MODULE_FILE="${gnome._gdkPixbufCacheBuilder_DO_NOT_USE {
       extraLoaders = [
+        libjxl
         librsvg
         webp-pixbuf-loader
       ];

pkgs/desktops/gnome/core/gnome-shell/default.nix

@@ -19,6 +19,7 @@
 , unzip
 , shared-mime-info
 , libgweather
+, libjxl
 , librsvg
 , webp-pixbuf-loader
 , geoclue2
@@ -188,10 +189,11 @@ stdenv.mkDerivation (finalAttrs: {
   '';
 
   postInstall = ''
-    # Pull in WebP support for gnome-backgrounds.
+    # Pull in WebP and JXL support for gnome-backgrounds.
     # In postInstall to run before gappsWrapperArgsHook.
     export GDK_PIXBUF_MODULE_FILE="${gnome._gdkPixbufCacheBuilder_DO_NOT_USE {
       extraLoaders = [
+        libjxl
         librsvg
         webp-pixbuf-loader
       ];

pkgs/desktops/gnome/core/nautilus/default.nix

@@ -19,6 +19,7 @@
 , shared-mime-info
 , libnotify
 , libexif
+, libjxl
 , libseccomp
 , librsvg
 , webp-pixbuf-loader
@@ -106,6 +107,7 @@ stdenv.mkDerivation (finalAttrs: {
     gappsWrapperArgs+=(
       # Thumbnailers
       --prefix XDG_DATA_DIRS : "${gdk-pixbuf}/share"
+      --prefix XDG_DATA_DIRS : "${libjxl}/share"
       --prefix XDG_DATA_DIRS : "${librsvg}/share"
       --prefix XDG_DATA_DIRS : "${webp-pixbuf-loader}/share"
       --prefix XDG_DATA_DIRS : "${shared-mime-info}/share"

pkgs/development/libraries/xdg-desktop-portal-gnome/default.nix

@@ -14,6 +14,7 @@
 , xdg-desktop-portal
 , wayland
 , gnome
+, libjxl
 , librsvg
 , webp-pixbuf-loader
 }:
@@ -50,10 +51,11 @@ stdenv.mkDerivation rec {
   ];
 
   postInstall = ''
-    # Pull in WebP support for gnome-backgrounds.
+    # Pull in WebP and JXL support for gnome-backgrounds.
     # In postInstall to run before gappsWrapperArgsHook.
     export GDK_PIXBUF_MODULE_FILE="${gnome._gdkPixbufCacheBuilder_DO_NOT_USE {
       extraLoaders = [
+        libjxl
         librsvg
         webp-pixbuf-loader
       ];