feat: 补发 ConfigureNotify 通知客户端实际几何

当 WM 拒绝窗口的 ConfigureRequest（因窗口需要重新布局）或映射
窗口时，按 ICCCM 规范主动向客户端发送 synthetic ConfigureNotify，
告知其当前真实几何，避免客户端状态不一致。

- core: 新增 NOTIFY_CONFIGURE 命令与 CONFIGURE_NOTIFY 效果，
  由 policy 在 window_need_layout 分支生成，plan 层下发
- backend(x11): 新增 configure 批次，map/notify 时查询实际几何
  并合成 ConfigureNotify 事件下发

src/backend/x11/backend.c

@@ -558,6 +558,7 @@ static void backend_merge_effects(
     switch (e->type) {
     case ZDWM_EFFECT_MAP_WINDOW:
       window_list_push(&backend->map, e->as.map.window);
+      window_list_push(&backend->configure, e->as.map.window);
       break;
     case ZDWM_EFFECT_UNMAP_WINDOW:
       window_list_push(&backend->unmap, e->as.unmap.window);
@@ -612,6 +613,9 @@ static void backend_merge_effects(
     case ZDWM_EFFECT_CONFIGURE_WINDOW:
       merge_window_configure_params(backend, &e->as.configure);
       break;
+    case ZDWM_EFFECT_CONFIGURE_NOTIFY:
+      window_list_push(&backend->configure, e->as.configure_notify.window);
+      break;
     case ZDWM_EFFECT_CHANGE_BORDER_COLOR: {
       xcb_change_window_attributes_value_list_t value = {
         .border_pixel = e->as.change_border_color.color->argb
@@ -643,6 +647,46 @@ static void backend_merge_effects(
   }
 }
 
+static void batch_send_configure_notify(
+  xcb_connection_t *conn,
+  xcb_window_t *windows,
+  size_t count
+) {
+  if (count == 0) return;
+
+  auto cookie_list = p_new(xcb_get_geometry_cookie_t, count);
+
+  for (size_t i = 0; i < count; ++i) {
+    auto window = windows[i];
+    cookie_list[i] = xcb_get_geometry(conn, window);
+  }
+
+  uint32_t event_mask = XCB_EVENT_MASK_STRUCTURE_NOTIFY;
+  for (size_t i = 0; i < count; ++i) {
+    auto window = windows[i];
+    auto cookie = cookie_list[i];
+    auto reply = xcb_get_geometry_reply(conn, cookie, nullptr);
+    if (!reply) continue;
+
+    xcb_configure_notify_event_t ev = {
+      .response_type = XCB_CONFIGURE_NOTIFY,
+      .event = window,
+      .window = window,
+      .above_sibling = XCB_WINDOW_NONE,
+      .x = reply->x,
+      .y = reply->y,
+      .width = reply->width,
+      .height = reply->height,
+      .border_width = reply->border_width,
+      .override_redirect = false,
+    };
+    xcb_send_event(conn, false, window, event_mask, (char *)&ev);
+    p_delete(&reply);
+  }
+
+  p_delete(&cookie_list);
+}
+
 static void backend_batch_apply_effects(backend_t *backend) {
   xcb_connection_t *conn = backend->conn;
   if (backend->unmap.count) {
@@ -672,6 +716,12 @@ static void backend_batch_apply_effects(backend_t *backend) {
 
   backend_apply_window_configure_list(backend);
 
+  {
+    auto windows = backend->configure.windows;
+    auto count = backend->configure.count;
+    batch_send_configure_notify(conn, windows, count);
+  }
+
   if (backend->update_focus) {
     backend_focus_window(backend, backend->focus_window);
   }
@@ -687,6 +737,7 @@ bool backend_apply_effect(
   window_list_reset(&backend->unmap);
   window_list_reset(&backend->map);
   window_list_reset(&backend->kill);
+  window_list_reset(&backend->configure);
 
   backend_merge_effects(backend, effects, effect_count);
   backend_batch_apply_effects(backend);

src/backend/x11/internal.h

@@ -115,6 +115,7 @@ typedef struct backend_t {
   window_list_t unmap;
   window_list_t map;
   window_list_t kill;
+  window_list_t configure;
 
   tray_host_t *tray;
 } backend_t;

src/core/command.h

@@ -11,6 +11,7 @@ typedef enum command_type_t {
   ZDWM_COMMAND_RAISE_WINDOW,
   ZDWM_COMMAND_WITHDRAW_WINDOW,
   ZDWM_COMMAND_CONFIGURE_WINDOW,
+  ZDWM_COMMAND_NOTIFY_CONFIGURE,
   ZDWM_COMMAND_CHANGE_WINDOW_STATE,
   ZDWM_COMMAND_START_MOVE_WINDOW,
   ZDWM_COMMAND_STOP_MOVE_WINDOW,
@@ -102,6 +103,7 @@ typedef struct command_t {
     only_window_data_t raise;
     only_window_data_t withdraw;
     configure_data_t configure;
+    only_window_data_t notify_configure;
     window_state_change_command_t state_change;
     start_interaction_command_t move;
     start_interaction_command_t resize;

src/core/plan.c

@@ -121,6 +121,16 @@ void plan_push_resize_effect(plan_t *plan, window_id_t window_id) {
   plan_push_effect(plan, &effect);
 }
 
+void plan_push_configure_notify_effect(plan_t *plan, window_id_t window_id) {
+  if (window_id_invalid(window_id)) return;
+
+  effect_t effect = {
+    .type = ZDWM_EFFECT_CONFIGURE_NOTIFY,
+    .as.configure_notify.window = window_id,
+  };
+  plan_push_effect(plan, &effect);
+}
+
 void plan_push_fullscreen_effect(
   plan_t *plan,
   window_id_t window_id,

src/core/plan.h

@@ -26,6 +26,7 @@ void plan_push_kill_effect(plan_t *plan, window_id_t window_id);
 void plan_push_withdraw_effect(plan_t *plan, window_id_t window_id);
 void plan_push_move_effect(plan_t *plan, window_id_t window_id);
 void plan_push_resize_effect(plan_t *plan, window_id_t window_id);
+void plan_push_configure_notify_effect(plan_t *plan, window_id_t window_id);
 void plan_push_fullscreen_effect(
   plan_t *plan,
   window_id_t window_id,

src/core/policy.c

@@ -771,6 +771,15 @@ static void route_window_state_request(
   command_buffer_push(out, &change_window_state_cmd);
 }
 
+static void
+add_notify_configure_command(command_buffer_t *out, window_id_t window) {
+  command_t notify_cmd = {
+    .type = ZDWM_COMMAND_NOTIFY_CONFIGURE,
+    .as.notify_configure = {.window = window},
+  };
+  command_buffer_push(out, &notify_cmd);
+}
+
 static void route_configure_request(
   state_t *state,
   const configure_data_t *data,
@@ -788,6 +797,7 @@ static void route_configure_request(
   }
 
   if (!state_workspace_show(state, window->workspace_id)) return;
+  add_notify_configure_command(out, data->window);
   if (window_need_layout(window)) return;
   auto workspace = state_workspace_get(state, window->workspace_id);
   if (layout_get(layouts, workspace->layout_id)) return;
@@ -1690,6 +1700,9 @@ void policy_apply_command(
     case ZDWM_COMMAND_CONFIGURE_WINDOW:
       configure_window(state, &cmd->as.configure, plan);
       break;
+    case ZDWM_COMMAND_NOTIFY_CONFIGURE:
+      plan_push_configure_notify_effect(plan, cmd->as.notify_configure.window);
+      break;
     case ZDWM_COMMAND_CHANGE_WINDOW_STATE:
       change_window_state(ctx, &cmd->as.state_change, plan);
       break;

src/interface/effect.h

@@ -17,6 +17,7 @@ typedef enum effect_type_t {
   ZDWM_EFFECT_MAXIMIZE_WINDOW,
   ZDWM_EFFECT_FULLSCREEN_WINDOW,
   ZDWM_EFFECT_CONFIGURE_WINDOW,
+  ZDWM_EFFECT_CONFIGURE_NOTIFY,
   ZDWM_EFFECT_CHANGE_BORDER_COLOR,
   ZDWM_EFFECT_CHANGE_WINDOW_LIST,
   ZDWM_EFFECT_RESTACK_WINDOWS,
@@ -86,6 +87,7 @@ typedef struct effect_t {
     effect_bool_window_t maximize;
     effect_bool_window_t fullscreen;
     configure_data_t configure;
+    only_window_data_t configure_notify;
     effect_change_border_color_t change_border_color;
     effect_window_list_t change_window_list;
     effect_window_list_t restack_windows;