add buttons to PointerState

engine/src/lib/ui/window/pointer_data_packet_converter.cc

           PointerData synthesized_hover_event = pointer_data;
           synthesized_hover_event.change = PointerData::Change::kHover;
           synthesized_hover_event.synthesized = 1;
+          synthesized_hover_event.buttons = state.buttons;
+        } else {
+          UpdateDeltaAndState(pointer_data, state);
-
+      
         UpdatePointerIdentifier(pointer_data, state, true);
         state.isDown = true;
         states_[pointer_data.device] = state;
           PointerData synthesized_move_event = pointer_data;
           synthesized_move_event.change = PointerData::Change::kMove;
           synthesized_move_event.synthesized = 1;
+          synthesized_move_event.buttons = state.buttons;
+        } else {
+          UpdateDeltaAndState(pointer_data, state);
-
+      
         state.isDown = false;
         states_[pointer_data.device] = state;
         converted_pointers.push_back(pointer_data);
   PointerState state;
   state.pointer_identifier = 0;
   state.isDown = false;
+  state.buttons = pointer_data.buttons;
   state.physical_x = pointer_data.physical_x;
   state.physical_y = pointer_data.physical_y;
   states_[pointer_data.device] = state;
                                                      PointerState& state) {
   pointer_data.physical_delta_x = pointer_data.physical_x - state.physical_x;
   pointer_data.physical_delta_y = pointer_data.physical_y - state.physical_y;
+  state.buttons = pointer_data.buttons;
   state.physical_x = pointer_data.physical_x;
   state.physical_y = pointer_data.physical_y;
   states_[pointer_data.device] = state;

engine/src/lib/ui/window/pointer_data_packet_converter.h

 struct PointerState {
   int32_t pointer_identifier;
   bool isDown;
+  int64_t buttons;
   float physical_x;
   float physical_y;
 };