Improve highlighting structure

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

src/editor/events.cc

@@ -6,8 +6,8 @@
 
 void Editor::handle_event(KeyEvent event) {
   uint8_t old_mode = mode;
-  if (this->hover_active)
-    this->hover_active = false;
+  if (!this->hover_popup->hidden)
+    this->hover_popup->hidden = true;
   if (event.key_type == KEY_SPECIAL) {
     switch (event.special_modifier) {
     case 0:
@@ -67,12 +67,12 @@ void Editor::handle_event(KeyEvent event) {
         this->select_all();
         break;
       case CTRL('h'):
-        static_cast<HoverBox *>(ui::hover_popup->tile.get())->scroll(-1);
-        this->hover_active = true;
+        this->hover_popup->scroll(-1);
+        this->hover_popup->hidden = false;
         break;
       case CTRL('l'):
-        static_cast<HoverBox *>(ui::hover_popup->tile.get())->scroll(1);
-        this->hover_active = true;
+        this->hover_popup->scroll(1);
+        this->hover_popup->hidden = false;
         break;
       case 'h':
         this->fetch_lsp_hover();