Improve highlighting structure

- switched to a sparse delta based map
- true lazy-loading to avoid any unneccessary allocations
- fixed windows management api

include/windows/decl.h

@@ -22,6 +22,12 @@ struct Window : Tile {
   virtual std::array<std::string, 5> bar_info() { return {}; };
 };
 
+struct Popup : Window {
+  Coord pos;
+  Coord size;
+  virtual ~Popup() = default;
+};
+
 struct TileBlock : Tile {
   bool vertical;
   std::vector<std::unique_ptr<Tile>> tiles;
@@ -82,11 +88,12 @@ struct TileBlock : Tile {
   }
 };
 
-struct TileRoot {
+struct TileBase {
   std::unique_ptr<Tile> tile;
   Coord pos;
   Coord size;
 
+  inline bool hidden() { return this->tile->hidden; }
   void render(std::vector<ScreenCell> &buffer) {
     if (this->tile->hidden)
       return;
@@ -97,21 +104,23 @@ struct TileRoot {
     event.mouse_y -= this->pos.row;
     this->tile->handle_click(event, size);
   }
-  bool inside(uint32_t x, uint32_t y) {
-    return x >= pos.col && x < pos.col + size.col && y >= pos.row &&
-           y < pos.row + size.row;
-  }
 };
 
-extern TileRoot root_tile;
-extern std::vector<std::unique_ptr<TileRoot>> popups;
+namespace layout {
+extern TileBase root_tile;
 extern Window *focused_window;
+extern std::vector<std::unique_ptr<Popup>> popups;
+extern std::vector<std::unique_ptr<TileBase>> floating_tiles;
+} // namespace layout
 
-inline void close_popup(TileRoot *handle) {
-  auto it = std::find_if(popups.begin(), popups.end(),
-                         [handle](const auto &p) { return p.get() == handle; });
-  if (it != popups.end())
-    popups.erase(it);
+inline void close(Popup *handle) {
+  std::erase_if(layout::popups,
+                [handle](const auto &p) { return p.get() == handle; });
+}
+
+inline void close(TileBase *handle) {
+  std::erase_if(layout::floating_tiles,
+                [handle](const auto &p) { return p.get() == handle; });
 }
 
 void render();