feat: set minimum supported xdg_wm_base to v2

River (and wlroots compositors in general) only support v2 of xdg_wm_base.
The most notable addition seems to be popups, which zig-wayland-wire is
not using ATM.

build.zig

@@ -5,7 +5,7 @@ pub fn build(b: *std.Build) void {
     const optimize = b.standardOptimizeOption(.{});
 
     const module = b.addModule("wayland", .{
-        .source_file = .{ .path = "src/main.zig" },
+        .root_source_file = .{ .path = "src/main.zig" },
     });
 
     const lib = b.addStaticLibrary(.{
@@ -41,6 +41,6 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
-    client_connect_exe.addModule("wayland", module);
+    client_connect_exe.root_module.addImport("wayland", module);
     b.installArtifact(client_connect_exe);
 }

src/main.zig

@@ -416,6 +416,10 @@ pub fn registerGlobals(alloc: std.mem.Allocator, id_pool: *IdPool, socket: std.n
                 .global => |global| {
                     var buffer: [20]u32 = undefined;
                     if (map.get(global.interface)) |item| {
+                        if (global.version < item.version) {
+                            // TODO: Add diagnostics API
+                            return error.OutdatedCompositorProtocol;
+                        }
                         const new_id = id_pool.create();
                         ids[item.index] = new_id;
                         const message = try serialize(core.Registry.Request, &buffer, registry_id, .{ .bind = .{

src/xdg.zig

@@ -1,6 +1,6 @@
 pub const WmBase = struct {
     pub const INTERFACE = "xdg_wm_base";
-    pub const VERSION = 4;
+    pub const VERSION = 2;
 
     pub const Request = union(Request.Tag) {
         destroy: void,