feat: 添加 _NET_WM_STATE_SKIP_TASKBAR 支持

- 新增 skip_taskbar 字段到 client_t
- 在 client_update_window_type 中检测并设置 skip_taskbar 状态
- 状态栏绘制时过滤 skip_taskbar 窗口

src/atoms-list.txt

@@ -27,6 +27,7 @@ _NET_WM_STATE
 _NET_WM_STATE_FULLSCREEN
 _NET_WM_STATE_MAXIMIZED_HORZ
 _NET_WM_STATE_MAXIMIZED_VERT
+_NET_WM_STATE_SKIP_TASKBAR
 _NET_WM_WINDOW_TYPE
 _NET_WM_WINDOW_TYPE_DIALOG
 _NET_SUPPORTED

src/client.c

@@ -366,6 +366,7 @@ void client_update_window_type(client_t *client) {
 
   if (state_reply) {
     xcb_atom_t state = *(xcb_atom_t *)xcb_get_property_value(state_reply);
+    client->skip_taskbar = state == _NET_WM_STATE_SKIP_TASKBAR;
     if (state == _NET_WM_STATE_FULLSCREEN) {
       client_set_fullscreen(client, true);
     }

src/monitor.c

@@ -350,7 +350,10 @@ static void monitor_draw_tasks(monitor_t *monitor, int16_t right_edge) {
   if (!task_list) return;
 
   uint16_t task_count = 0;
-  for (task_in_tag_t *task = task_list; task; task = task->next) ++task_count;
+  for (task_in_tag_t *task = task_list; task; task = task->next) {
+    if (task->client->skip_taskbar) continue;
+    ++task_count;
+  };
   if (task_count == 0) return;
 
   int16_t x = monitor->layout_symbol_extent.end;
@@ -361,6 +364,8 @@ static void monitor_draw_tasks(monitor_t *monitor, int16_t right_edge) {
   if (task_width < wm.font_size) return;
 
   for (task_in_tag_t *task = task_list; task; task = task->next) {
+    if (task->client->skip_taskbar) continue;
+
     task->bar_extent.start = x;
     task->bar_extent.end = x + task_width;
     x += task_width;

src/types.h

@@ -38,6 +38,7 @@ struct client_t {
   bool minimize;
   bool sticky;
   bool urgent;
+  bool skip_taskbar;
   bool size_freeze; /* 尺寸冻结窗口一定是浮动窗口 */
 
   char *class, *instance;