update niri config for 25.05

templates/.config/niri/config.kdl.j2

@@ -175,6 +175,10 @@ layout {
         // top 64
         // bottom 64
     }
+
+    // background layers are placed in the "backdrop" instead of the
+    // "background" so they do not scroll when the workspace changes.
+    background-color "transparent"
 }
 
 // Add lines like this to spawn processes at startup.
@@ -497,3 +501,17 @@ binds {
     // moving the mouse or pressing any other key.
     Mod+Shift+P { power-off-monitors; }
 }
+
+// Make the wallpaper stationary, rather than moving with workspaces.
+layer-rule {
+    // This is for wpaperd; change for other wallpaper tools.
+    // Find the right namespace by running `niri msg layers`.
+    match namespace="^wpaperd-"
+    place-within-backdrop true
+}
+
+overview {
+    workspace-shadow {
+        off
+    }
+}