wayland/xdg-shell: Add support for xdg_toplevel edge constraints

They extend the tiling capabilities of xdg-shell by communicating when a
window cannot be resized from a specific edge, e.g. because it's next to
a monitor edge.

It is roughly equivalent to the gtk_surface1 edge constraint enum.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3266>

Author: jadahl

.gitlab-ci.yml

@@ -106,7 +106,7 @@ variables:
     - .skip-git-clone
   variables:
     FDO_DISTRIBUTION_VERSION: 42
-    BASE_TAG: '2025-03-31.0'
+    BASE_TAG: '2025-04-08.0'
     MUTTER_USER: 'meta-user'
     FDO_DISTRIBUTION_PACKAGES:
       accountsservice-devel

.gitlab-ci/install-common-dependencies.sh

@@ -124,10 +124,10 @@ then
       master
 fi
 
-#if ! pkgconf --atleast-version 1.41 wayland-protocols
-#then
-#    ./$SCRIPTS_DIR/install-meson-project.sh \
-#      "${OPTIONS[@]}" \
-#      https://gitlab.freedesktop.org/wayland/wayland-protocols.git \
-#      1.41
-#fi
+if ! pkgconf --atleast-version 1.43 wayland-protocols
+then
+    ./$SCRIPTS_DIR/install-meson-project.sh \
+      "${OPTIONS[@]}" \
+      https://gitlab.freedesktop.org/wayland/wayland-protocols.git \
+      1.43
+fi

meson.build

@@ -47,7 +47,7 @@ gudev_req = '>= 238'
 
 # wayland version requirements
 wayland_server_req = '>= 1.23'
-wayland_protocols_req = '>= 1.41'
+wayland_protocols_req = '>= 1.43'
 
 # native backend version requirements
 libinput_req = '>= 1.27.0'

src/wayland/meta-wayland-versions.h

@@ -34,7 +34,7 @@
 /* Global/master objects (version exported by wl_registry and negotiated through bind) */
 #define META_WL_COMPOSITOR_VERSION          6
 #define META_WL_DATA_DEVICE_MANAGER_VERSION 3
-#define META_XDG_WM_BASE_VERSION            6
+#define META_XDG_WM_BASE_VERSION            7
 #define META_WL_SEAT_VERSION                8
 #define META_WL_OUTPUT_VERSION              4
 #define META_XSERVER_VERSION                1

src/wayland/meta-wayland-xdg-shell.c

@@ -746,6 +746,19 @@ fill_states (MetaWaylandXdgToplevel         *xdg_toplevel,
       if (window->edge_constraints.left != META_EDGE_CONSTRAINT_NONE)
         add_state_value (states, XDG_TOPLEVEL_STATE_TILED_LEFT);
     }
+
+  if (wl_resource_get_version (xdg_toplevel->resource) >=
+      XDG_TOPLEVEL_STATE_CONSTRAINED_LEFT_SINCE_VERSION)
+    {
+      if (window->edge_constraints.top == META_EDGE_CONSTRAINT_MONITOR)
+        add_state_value (states, XDG_TOPLEVEL_STATE_CONSTRAINED_TOP);
+      if (window->edge_constraints.right == META_EDGE_CONSTRAINT_MONITOR)
+        add_state_value (states, XDG_TOPLEVEL_STATE_CONSTRAINED_RIGHT);
+      if (window->edge_constraints.bottom == META_EDGE_CONSTRAINT_MONITOR)
+        add_state_value (states, XDG_TOPLEVEL_STATE_CONSTRAINED_BOTTOM);
+      if (window->edge_constraints.left == META_EDGE_CONSTRAINT_MONITOR)
+        add_state_value (states, XDG_TOPLEVEL_STATE_CONSTRAINED_LEFT);
+    }
 }
 
 static void