feat(core+backend/X11): 实现窗口边框管理和焦点跟随鼠标

src/base/color.c

@@ -1,4 +1,4 @@
-#include "color.h"
+#include "base/color.h"
 
 #include <stddef.h>
 #include <stdint.h>

src/base/window_list.c

@@ -0,0 +1,26 @@
+#include "base/window_list.h"
+
+#include <zdwm/types.h>
+
+#include "base/array.h"
+#include "base/memory.h"
+
+void window_list_push(
+  window_list_t *window_list,
+  zdwm_window_id_t window_id
+) {
+  zdwm_window_id_t *window =
+    array_push(window_list->windows, window_list->count, window_list->capacity);
+  *window = window_id;
+}
+
+void window_list_reset(window_list_t *window_list) {
+  p_clear(window_list->windows, window_list->capacity);
+  window_list->count = 0;
+}
+
+void window_list_cleanup(window_list_t *window_list) {
+  p_delete(window_list->windows);
+  window_list->count    = 0;
+  window_list->capacity = 0;
+}

src/base/window_list.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <stddef.h>
+#include <zdwm/types.h>
+
+typedef struct window_list_t {
+  zdwm_window_id_t *windows;
+  size_t count;
+  size_t capacity;
+} window_list_t;
+
+void window_list_push(window_list_t *window_list, zdwm_window_id_t window_id);
+void window_list_reset(window_list_t *window_list);
+void window_list_cleanup(window_list_t *window_list);