valw: overview backdrop and window picker

flake.lock

@@ -720,8 +720,8 @@
         ]
       },
       "locked": {
-        "lastModified": 1790991298,
-        "narHash": "sha256-wRzf+LZhsANpL9NeK8WR3HvupwcgoJdSf6Fho0Tkw7k=",
+        "lastModified": 1791067497,
+        "narHash": "sha256-NZFD6YvMg3CY6b8ESUU6Ad2Xl6EIB/a5GKLyaAv0eG0=",
         "path": "/home/elars/Projects/valw",
         "type": "path"
       },

modules/home/home-noctalia.ulu.nix

@@ -31,7 +31,8 @@
           };
 
           backdrop = {
-            enabled = true;
+            # valw draws the overview backdrop now (valw backdrop).
+            enabled = false;
             blur_intensity = 0.46;
             tint_intensity = 0.25;
           };

modules/home/niri/desktop-niri-execs.ulu.nix

@@ -7,6 +7,8 @@
         "prefer-no-csd" = true;
         spawn-at-startup = [
           { command = [ "noctalia" ]; }
+          # valw's paint shader behind the overview (see the layer rule).
+          { command = [ "valw" "backdrop" ]; }
         ];
       };
     };

modules/home/niri/desktop-niri-general.ulu.nix

@@ -79,6 +79,12 @@
             ];
             place-within-backdrop = true;
           }
+          {
+            matches = [
+              { namespace = "^valw-backdrop$"; }
+            ];
+            place-within-backdrop = true;
+          }
         ];
       };
     };