feat(float): add fclose command

src/nvim/window.c

@@ -7658,3 +7658,29 @@ win_T *lastwin_nofloating(void)
   }
   return res;
 }
+
+static int floating_zindex_compare(const void *a, const void *b)
+{
+  return (*(win_T **)b)->w_float_config.zindex - (*(win_T **)a)->w_float_config.zindex;
+}
+
+void win_float_remove(bool bang, int count)
+{
+  kvec_t(win_T *) float_win_arr = KV_INITIAL_VALUE;
+  for (win_T *wp = lastwin; wp && wp->w_floating; wp = wp->w_prev) {
+    kv_push(float_win_arr, wp);
+  }
+  qsort(float_win_arr.items, float_win_arr.size, sizeof(win_T *), floating_zindex_compare);
+  for (size_t i = 0; i < float_win_arr.size; i++) {
+    if (win_close(float_win_arr.items[i], false, false) == FAIL) {
+      break;
+    }
+    if (!bang) {
+      count--;
+      if (count == 0) {
+        break;
+      }
+    }
+  }
+  kv_destroy(float_win_arr);
+}