gtk: add option to not link against libX11

.github/workflows/test.yml

@@ -329,25 +329,53 @@ jobs:
       - name: Test GTK Build
         run: nix develop -c zig build -Dapp-runtime=gtk -Dgtk-adwaita=true -Demit-docs
 
-      - name: Test GTK Build (No Libadwaita)
-        run: nix develop -c zig build -Dapp-runtime=gtk -Dgtk-adwaita=false -Demit-docs
-
-      - name: Test GTK build with explicit X11
-        run: nix develop -c zig build -Dapp-runtime=gtk -Dgtk-adwaita=true -Demit-docs -Dgtk-x11=true
-
-      - name: Test GTK build with no X11
-        run: nix develop -c zig build -Dapp-runtime=gtk -Dgtk-adwaita=true -Demit-docs -Dgtk-x11=false
-
-      - name: Test GTK build with no Adwaita and no X11
-        run: nix develop -c zig build -Dapp-runtime=gtk -Dgtk-adwaita=false -Demit-docs -Dgtk-x11=false
-
       - name: Test GLFW Build
         run: nix develop -c zig build -Dapp-runtime=glfw
 
       # This relies on the cache being populated by the commands above.
       - name: Test System Build
         run: nix develop -c zig build --system ${ZIG_GLOBAL_CACHE_DIR}/p
 
+  test-gtk:
+    strategy:
+      fail-fast: false
+      matrix:
+        adwaita: ["true", "false"]
+        x11: ["true", "false"]
+    runs-on: namespace-profile-ghostty-md
+    needs: test
+    env:
+      ZIG_LOCAL_CACHE_DIR: /zig/local-cache
+      ZIG_GLOBAL_CACHE_DIR: /zig/global-cache
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Cache
+        uses: namespacelabs/[email protected]
+        with:
+          path: |
+            /nix
+            /zig
+
+      - name: Test GTK Build
+        run: |
+          nix develop -c \
+            zig build \
+            -Dapp-runtime=gtk \
+            -Dgtk-adwaita=${{ matrix.adwaita }} \
+            -Dgtk-x11=${{ matrix.x11 }}
+
+      # Install Nix and use that to run our tests so our environment matches exactly.
+      - uses: cachix/install-nix-action@v30
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v15
+        with:
+          name: ghostty
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+
   test-macos:
     runs-on: namespace-profile-ghostty-macos
     needs: test

src/apprt/gtk/key.zig

@@ -114,18 +114,19 @@ pub fn eventMods(
     const device = c.gdk_event_get_device(event);
 
     var mods = mods: {
+        // Add any modifier state events from Xkb if we have them (X11
+        // only). Null back from the Xkb call means there was no modifier
+        // event to read. This likely means that the key event did not
+        // result in a modifier change and we can safely rely on the GDK
+        // state.
         if (comptime build_options.x11) {
             const display = c.gtk_widget_get_display(widget);
             if (x11_xkb) |xkb| {
-                // Add any modifier state events from Xkb if we have them (X11
-                // only). Null back from the Xkb call means there was no modifier
-                // event to read. This likely means that the key event did not
-                // result in a modifier change and we can safely rely on the GDK
-                // state.
                 if (xkb.modifier_state_from_notify(display)) |x11_mods| break :mods x11_mods;
                 break :mods translateMods(gtk_mods);
             }
         }
+
         // On Wayland, we have to use the GDK device because the mods sent
         // to this event do not have the modifier key applied if it was
         // presssed (i.e. left control).