sway: remove gtk window decoration

overlays/default.nix

@@ -36,7 +36,10 @@
         '';
     };
     papirus_red = (final.unstable.papirus-icon-theme.override { color = "red"; });
-    orchis_theme_compact = (final.orchis-theme.override { tweaks = [ "compact" "solid" ]; });
+    orchis_theme_compact = (final.orchis-theme.override {
+      border-radius = 0;
+      tweaks = [ "compact" "solid" ];
+    });
     nerdfonts_fira_hack = (final.nerdfonts.override { fonts = [ "FiraCode" "Hack" ]; });
   });
 

pkgs/default.nix

@@ -6,4 +6,5 @@
   cargo-checkmate = pkgs.callPackage ./cargo-checkmate.nix { };
   lipsum = pkgs.callPackage ./lipsum.nix { inherit inputs; };
   amdgpu-kernel-module = pkgs.callPackage ./amdgpu-kernel-module.nix { };
+  gtk3-nocsd = pkgs.callPackage ./gtk3-nocsd.nix { };
 }

pkgs/gtk3-nocsd.nix

@@ -0,0 +1,40 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, pkgconfig
+, gtk3
+, gobject-introspection
+}:
+
+stdenv.mkDerivation rec {
+  pname = "gtk3-nocsd";
+  version = "3.0.1";
+
+  src = fetchFromGitHub {
+    owner = "ZaWertun";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "035rrn9jq9bdfkmmj6xl4q8paqx7xf3hxsw6gslgk86sh7x56lvi";
+  };
+
+  buildInputs = [
+    gtk3
+    gobject-introspection
+  ];
+
+  nativeBuildInputs = [
+    pkgconfig
+  ];
+
+  makeFlags = [
+    "prefix=${placeholder "out"}"
+  ];
+
+  meta = with lib; {
+    description = "A hack to disable gtk+ 3 client side decoration";
+    homepage = https://github.com/PCMan/gtk3-nocsd;
+    license = licenses.lgpl21Plus;
+    # maintainers = with maintainers; [ peanutbutter144 ];
+    platforms = platforms.linux;
+  };
+}

user/sway.nix

@@ -188,7 +188,13 @@ in
             };
           floating = {
             modifier = "Mod4";
-            criteria = [{ class = "file_picker"; } { app_id = "file_picker"; }];
+            criteria = [
+              { class = "file_picker"; }
+              { app_id = "file_picker"; }
+              { app_id = "wdisplays"; }
+              { app_id = "pavucontrol"; }
+              { app_id = ".*[Hh]elvum.*"; }
+            ];
           };
           keybindings =
             let
@@ -471,6 +477,7 @@ in
       sway
       swaybg
       swaylock
+      wdisplays
 
       waybar
       dhist
@@ -509,5 +516,9 @@ in
       };
     };
     home.file = { ".local/share/backgrounds".source = ./backgrounds; };
+    home.sessionVariables = {
+      LD_PRELOAD = "${pkgs.gtk3-nocsd}/lib/libgtk3-nocsd.so.0";
+      GTK_CSD = "0";
+    };
   };
 }

user/theme.nix

@@ -24,7 +24,14 @@ in
       name = icon_theme;
       package = pkgs.papirus_red;
     };
-  };
+  } // (
+    let
+      shared.extraConfig = {
+        gtk-decoration-layout = "menu:";
+      };
+    in
+    { gtk4 = shared; gtk3 = shared; }
+  );
   # qt = {
   #   enable = true;
   #   platformTheme = "gtk";
@@ -39,6 +46,9 @@ in
       cursor-theme = cursor_theme;
       color-scheme = "prefer-${color.type}";
     };
+    "org/gnome/desktop/wm/preferences" = {
+      button-layout = "menu:";
+    };
   };
 
   # fonts.fontconfig.enable = true;